Let me try to tell everyone about what I have now and I would like some advice as to what heads would be a real good choice to go with. I will start from top to bottom. 2 450cfm Holley carbs on a weiand tunnel ram intake.
This on top of a 350 chevy with 2 eyebrow flat tops and Cam is .540-.534 lift 290-304 dur. 106 lobe sep. Center Force Dual Friction Clutch M-21 Muncie 4 speed then ladder bar suspended Dana 60 w/ 4.56 gears and 31x14.5 M&H cheater slicks in a 2900 lb 66 chevy II. The reason I am asking is the heads that are on the car are 72-74 chevy with minor pocket port work done and the car has alot left in it but I think the heads are holding it back. I am going to change them real soon but not sure which would be the best. I have never been much on head (or cam for that matter) choices and don't know what size intake runner would be best or much of anything as to where to start.
All help is greatly appreciated,
Scott