427
I ran a 427 .03 over 12.5 comp canfield 310 heads cam 671/690 248/254 dur 106.5 cl victor 454r 4500 intake i had a 850 on it and went to a 1050 it picked up 3 tenths car weighed 2600lbs with a 4.56 gear 32 tall tire it ran 9.70s went to a 4.88 it went 9.50s it really liked the steeper gears this was also with a turbo 350 and 5000 stall. Just thought this might help.