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I cured vapour lock on my 440 by removing the factory fuel pump & fitting a Carter #4594 elec pump. VP lock is usually worse, or causes more problems, at idle & low cruise rpm. That is because the engine is using less fuel. The fuel stays in the pumped & lines longer....getting cooked by the heat.

Quite agree! But it is still an elec pump pushing the same fuel to the engine....

An electric pump does fix v/lock. Modern cars use elec pumps.....& the same fuel.....& they don't get v/lock. Pump needs to be mounted near the tank.

The best vapour lock additive is to get rid of the mech fuel pump & use a Carter elec pump mounted near the tank.

Big carb guys: Did you read what the OP said: Chall, 3.23 gears, street driving. There is a guy floating around on the net with a 289 Ford that has a lawn mower carb on it, gets up to 75 mph. Wonder how many cfm THAT carb is, 15, 20?

Make sure the met rod pistons are free to move up & down in their bores. As you load the engine, the piston springs should push the pistons UP so that the thin section [ enrichening ] of the m/rods are in the jets. Could be a broken spring, rare.

Um..... Give it Elon Musk for one of his Teslas...stop them catching fire

6 psi.

This ^^^^. To help keep the epoxy in place, drill a couple of small holes at different angles next to the plug. heat. Warm the carb base & THEN apply the epoxy. It will flow into the holes & lock the epoxy insert in place.

2.76 axle, mild cam, the 650 AVS2 will be perfect. Congrats on not falling for bigger is better...

[1] If you want to improve the secondary performance, look for the thread in my name in this section, early Oct last year. The sec mod gives the carb a big WAKE UP call. [2] As mentioned, the caps under the pri jets are sealed with white epoxy. They leak over time & it is very hard to see any...

Start with std jetting. A bigger engine doesn't necessarily mean bigger jets because the bigger engine creates more depression [ suction ] & pulls more fuel. A good example is in the MP bulletins. A TQ on 340-360 had 0.169" sec jets. TQ on a 440 had 0.137" sec jets.

Making a spacer is a LOT of work to mount carb that can easily be drilled to work with your intake......... & it will not harm or weaken the carbs. I have TWO engines that have 4500 Holley bolt pattern intakes......& they TQs bolted directly to them without a spacer.

And...

...everybody missed post #35....... That is a sizeable cam & will have a rough idle. If the initial timing is still at factory specs of between 4-15* [ 12* is typical ], then not only will the idle be rougher than it needs to be....but the engine will run hotter at idle & low speeds. The idle...

Yes, modern engines run at 210*; but they also have detonation sensors & all types of other sensors that allows safe running at those temps. The old bangers do not have this.... What cam is in this engine & what is the ign timing at idle?

All good mate. Always a beer in the fridge if you are in town......

How is your toilet working? Mine is working good.....

From the specs provided, I agree the 800 would be best....

OP is wanting to use Carter AVS carbs. They do not have the inner set of mounting holes drilled, to suit his intake, so he would need to drill the holes in the carbs....

RRR, You can borrow my glasses. I said drill the carbs, NOT the intake....

RRR, Huh?

Not all AFBs had both both bolt patterns, but the bodies were cast so that they could drilled for both bolt patterns.

The AVS has the wide mounting pattern but Carter kindly added the extra width to the mounting feet for both bolt patterns. All you need to do is drill the holes. Done it many times....

As others suggested, air is entering the line on the SUCTION side. So as well as a hose or fitting leaking, it could also be the new fuel pump.

That will work well! There will only be airflow from the TQ secondaries......if & when the engine requires that additional airflow.

TQ flow rating. Steve Dulchich claims the 850 actually flows over 900 cfm. I read that in an article he wrote in one of the Mopar magazines; he said we flowed them, do not know the 'we' is. It could be David Vizard because SD worked with him for awhile.

Dale, Facts do not change because 50 [ or more ] years have passed.....Some folks might like to think so because it suits their agenda....

Forphorty, If, could....

The 650 AVS2 would be the best carb for your combination. Forget about the brawler, crawler BS carbs. Some just don't get it..... I posted the page below on another thread on this forum. It is very informative about carb size. 383 Dodge v 428 Ford. Dodge was 3.3% lighter but was down 45 cubes...