410 Compression Test and tuning.

If theyre that even, youre good.
Could probably run 87E10 with those numbers. I ran it in my 366 Eddie headed combo with 185psi at one time, and currently with 165 psi.That was with a 3.58 stroke. Your 4"arm will dwell at the top a little longer, but with your psi, with a tight quench design,I would certainly try it as a 2bbl. If it passes that, Id move up;gently.Without the tight quench,Ummmmm, maybe not.

If its drifting 2 inches at idle, thats likely a mixture thing.If its a regular drop, could be more serious.http://www.imperialclub.org/Repair/Fuel/VacuumGauge/index.htm