Just read though the thread and the 1st issue I saw was the carb...that carb is to small for all the mods done to the engine...that's why it was not running properly. Running lean on break in will cause more heat and cause it to run unevenly. Run it with your radiator cap off to get the air out. Air pockets in the system could cause a head gasket to blow. The engine won't run right till some more fuel is added as well as cfm. Timing should be set around 8-10 without vacuum, 20-25 with vacuum and no more than 36 degrees full advance or you risk detonation. And it looks like you've got the same cam specs as the one put in my 292! lol! Will be interesting to see how they sound as far as lopiness...mine will be a little smoother because its larger. The offy is an ok manifold, but the clifford is better quality. TJ

Last edited by TJ's Chevy; 02/05/15 12:16 AM.

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