Here's an article about how to get rid of the Edelbrock stumble.
http://webrodder.com/article.php?AID=522&SID=60


383B, 9.8:1, Lunati 60302(220/226@0.050 262/268Dur, 0.475"/0.494", Stealth heads, Performer manifold, QF SS-750-AN carb, 3.31Diff, A833 4-speed manual.