Guarantee a 360 with 10 to 1 compression (true compression) with a set of J heads(202 160 valves) with JUST POLISHING the exhaust side,.484 purple cam,Performer RPm intake(I rather go with the stealth) 3310 out of the box holley, headers(1 5/8 or 1 3/4 dont really matter), 2800 stall with 391 gears, will set you in the 12.50s w/out a doubt, for sure NEXT