My old combo in my 74cuda went 12.20's. I had 452 heads with a torkerII intake and a comp xe295hl cam. The engine is 440 .30 over with 2355 pistons (10.5) compression. I changed to Indy Ez's (stock port)and victor int with a hughes solid cam 579 lift with 252/256 @50 dur. I now run 11.50's all day with stock susp and a crappy TCI 3500 conv. and 3.91's out back. I dont know how much the heads were worth alone but i know if i step up the power in the future they will handle it.