Idle issue with 63 chevy

[nxtruck]

One other thing to think about, which may or may not be causing you trouble, is the fact that the Edelbrock carbs can't tolerate as much fuel pressure as, say, a Holley can. I found this out the hard way on my son's '65, as it had a rich idle issue that I couldn't tune out of it. After doing some research on Edelbrock carbs, I learned that they are calibrated to run with no more than about 5-5 1/2 lbs. of pressure. The stock mechanical pump was putting out between 7-8 lbs. at idle, so I threw a Holley blue regulator on it, backed the pressure down to 5 lbs., and then it was responsive to idle screw adjustments. Like I said, this may not be an issue for you, but it's something to keep in mind.
Good luck with yours!