Well I have a 65 225 charger slant six. Balanced blue printed. 40 over piston 10to 1 flat tops. Block decked 15k the head was decked 110k. The head was ported and polished. I had the biggest valve put in it that would fit... dont know the size. I had a strong cam put in it custom ground from Erson cams. Roller rockers from T and D. Clifford performance kit with 500cfm 2 bbl weber carb. The kit comes with carb intake headers, fuel regulator. true 2.5 dual exhaust with cherry bomb vortex mufflers. 48k volts MSD coil with NGK plugs.