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I sprayed WD-40 every place I could reach. No stumble or increase in RPMs.

Correct. If I put my hand over the primary air horn, the rpms increase noticeably.

Timing port was plugged or T-ed off with another gauge to make sure advance wasn't pulled in while f-ing with everything else.

Yep. Plugged PCV and unplugged. Same vacuum numbers either way.

JW - Everything was capped or plugged when tuning including Booster and PCV. When you say timing, do you mean ignition timing or cam to crank timing? I assume ignition. I'm running 17 degrees initial with 35 all in by 3000rpms but I tried everything from 6 degrees initial to 22 degrees...

Gas is fresh. Good point though.

So I swapped a perfectly working '71 TQ and the problem persists. I'm getting about 9-10" vacuum with both carbs and I tried several base gaskets. After everything, the leak is coming from under the intake or what? Bad valves?? I'm going to perform a leak down and compression test once the...

$800 - Yikes! I think the receipt for $500 is from 2018. Gives the word inflation a new meaning.

Yeah, I had every vacuum port plugged on the intake and carb. I mean everything and the idle was hunting and the car stalls when I put it in gear. I'm going to try a carb swap with my other '71 340. The Edelbrock750 would not stall when I put the car in gear but the idle wasn't great...

I'm not even close to being "spot on" or "on the money." I would graciously settle for the car not stalling when I put it in gear. I have another '71 Challenger with the same carb and mostly stock. I'm going to swap carbs this weekend and see what happens. At least I should be able to...

I assume nothing. I am not the original purchaser of the rebuild and therefore don't have a vested interest from Scott Smith's point of view. It would be like if you bought a car from someone who bought a car from me and thinking I owe you. I would not make such a presumption but that is just me.

Bewy - I have another 1971 Challenger with the same carb. I'm going to swap carbs this weekend and see what happens but your probably right.

Edel wandering but much less than TQ. Bone stock visually and listening to exhaust note - no lopey cam noise. I highly doubt the cam if not stock, is close. My low vacuum is likey internal carb or under intake. Vaccum advance is not being activated. Tuned with advanced plugged or T-ed with...

Reread your post. CORRECTION - I just checked and the metering rods stay mostly DOWN down. Fluctuate but mostly down.

Advance was either plugged or T-ed off when tuning. I'm sure distributor advance wasn't contributing. If the problem is vacuum related, it's either internal in the carb or under manifold which I'll pull as a last resort.

yes, 0-3 when I was fussing with the idle screw but played with mixing screws enough to get a fair idle with 0 vacuum at port which is where it is set now.

Now this is interesting. I'll go back and double check but the rods and tower were moving up and down slightly when idling but mostly stayed at the TOP.

Unknown mileage on engine but doesn't smoke or behave like a high mileage motor. All vacuum access points were plugged when I was tuning carb and engine ran essentially the same with everything hooked up. I suppose I should pull the carb and check the pods.

I didn't pay to have the carb rebuilt. It came with the car when i purchased it.

Timing was steady at idle, maybe plus or minus 1/2 degree. I had a vacuum gauge hooked up to both manifold pressure and the carb advance port time. Manifold was 9-10 and fluctuating, vacuum port pressure was 0-3 degrees depending how I was playing with idle screw but even at 3 degrees, timing...

$500 according to the receipt but it wasn't me who had it done. Carb came in the shipping box with the car. Pretty though.

LOL. Wandering, not Wondering. Let's say hunting instead.

Correct gaskets, not quadrojet gaskets. I didn't check float level. New rebuilt so I just installed it as-is. Metering rods move up and down slightly at idle. Regarding mixture screws, engine stalls out when either screw is turned all the way in so i don't think idle jet is blocked. All...

Thanks I'll try that. The meter rods (tower) drift up and down slightly as the idle wonders up and down.

The Eddy carb ran better and didn't stall when I put it in gear but the idle still wondered but not nearly as bad.

I have not. Where is the adjustment and which way to adjust to lean out?

Ok. At my witts end. I have a Harms rebuilt (2018) 1971 Thermoturd that was never run. Bone stock 1971 340 except has electronic ignition. Installed carb with new base gaskets (twice) and I'm only getting about 9-10 inHg vacuum. All external manifold and carb vacuum ports have been plugged...

Two are 2015 and two are 2016.

Correction - I measured outside to outside of the bead contact area. The rims widths are likely smaller, probably 5.5 inches.

I'll check and get back to you.