Is my Vacuum too low?

AJ/FormS said
You can set the idle speed as low as you want to,until it stalls going into gear, or you end up with oil-pressure issues. The factory numbers are for emissions readings. If she bangs when going into gear, the idle-speed is too high.
Typically, the Rs will drop 50 to 100 rpm from neutral to engaged, and typically a teener will idle at 600/550 in gear with the anemic factory timing. So with 12* it could idle even slower. So in your case, the idle speed is sortof a personal preference. But if the Transfer slot exposure gets too far out of whack, you will have driveability issues such as bogs, hesitations,and soot. With a stock cam, she should have no problem idling down to 550 in gear. If it won't, then suspect a low-speed circuit issue. And with the falling out mixture screws , Ima thinking this.

Appreciate all your help. at the current 750 idle speed in Park, it drops to about 625 in gear.( from memory... will confirm)

I'm going to be honest and tell you I don't know what a transfer slot is, or what adjustments I may have made to get it into, or out of whack.

Once Jack Frost relaxes a bit and I can open the garage door without freezing solid ( you are a Manitoba man, I know you understand that bit!) I will happily drop the idle speed, maybe back off the timing a bit and fiddle with the mixture screws with the vacuum gauge in place. I am "mostly" confident that my Carburetor is assembled and internally adjusted correctly. I really took my time with it, and have done a few carbs over the years, not a pro, but I can usually follow directions.

thanks again to you, and to all the patient souls out there offering advice.