Issue is with that small carb your starving the engine for fuel so you Won't get the best performance out of it. You have opened up the engine to breathe better but its still starved and the exhaust has a good amount of back pressure. It'll run good for sure, but it won't be to its best by any means. 2 barrel intakes are not available, but you Can get an adapter to adapt a 350/500 cfm holley two barrel to the stock manifold. That and Langdon's headers would make a good difference from stock. A 500 cfm edelbrock mounted on either an offy or clifford with Langdon or cifford headers will make the best difference. But whatever you decide will be cool anyhow. Good luck to ya!

Last edited by TJ's Chevy; 07/02/15 11:01 AM.

1966 C10 292/tko600 http://67-72chevytrucks.com/vboard/showthread.php?t=596643
1964 C20 292/sm420