the heads are edelbrock performer RPM heads. this cam with work with all hardware installed in the heads. 2.19/1.88 and 290cc flow. the pistons are .210 dome pistons with valve reliefs. i should be ok for clearance. this is a 76 1 ton truck. it will be used for everything from driving daily to 4x4 to towing. i'm running a 2500 stall convertor so i can still have power in the lower rpm range. i'm running about 10.25 to 1 static compression.