Its a 408 ci big block (396 +60) 8.5:1 compression, hooker long tubes 2'' into 3 1/2", valve job not sure what size, port and polish, open chamber heads. IF YOU NEED MORE INFO PLEASE LET ME KNOW, THANKS!!!

Need cam specs, manifold information, carb size, ect. You did not give enough specs to plug into the program.

Cam is Basic Operating RPM Range: 1,600-5,800
Intake Duration at 050 inch Lift: 224
Exhaust Duration at 050 inch Lift: 230
Duration at 050 inch Lift: 224 int./230 exh.
Advertised Intake Duration: 268
Advertised Exhaust Duration: 280
Advertised Duration: 268 int./280 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.515 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.520 in.
Valve Lift with Factory Rocker Arm Ratio: 0.515 int./0.520 exh. lift
Lobe Separation (degrees): 110

Intake is a edelbrock performer rpm

carb is a 750 edelbrock