I have a question on vacuum as well. I hooked up a lombata sensor on the tail pipes to adjust the carb, after some messing around with it I found that at idle it had an a/f of 14:1 at 800 rpm. But once I ran it up to 2000rpm found that the a/f went up to 20:1 at part throttle cruise mode. So after jetting the carb and putting new rods and springs in, I found at 2000rpm it dropped to about 16.5-17 a/f. This is a performer series edelbrock, #1405.
Now there is one valve that is out of adjustment, making a bit of noise at idle, and I was wondering if this could cause a vacuum leak that is giving me the grief. I had a vacuum guage on it and it's pulling 14.5" at idle. Is this enough, or should i start tracking down a vac leak? I should also mention that I have a proform hei dist on it as well with the vac advance.