The car has a decent cooling system elec WP, 160 degree thermosat and runs at about 180 degrees. The static compression is 12.5:1 and the Dynamic is 8.75:1. It's going to be a 383ci motor with 6.0 eagle esp rod, an eagle cast crank and most likely KB pistons. Also How thick is an impalla head gasket? and the stock ported head is close to 56cc? Thanks Cameron
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Camshaft, Rod Length, Boost and Altitude Correction to Compression

Your engine summary is as follows: Bore 4.03 inches, stroke 3.75 inches, rod c-c length 6. inches, with a static compression ratio of 12.5 :1. Your camshaft specifications call for an inlet valve closing of 77 degrees ABDC (after bottom dead center).

Your chamber volume is 68.16 cc's. With this camshaft your dynamic, or effective stroke is 2.58 inches. Your dynamic compression ratio is 8.75 :1 corrected for cam timing, altitude, and rod length. Your dynamic cranking pressure, corrected for cam timing, rod length and altitude is 178.48 PSI. Your dynamic boost compression ratio, reflecting static c.r., cam timing, altitude, and 0 PSI is 8.75 :1.

 

There is quite a bit of discussion you can search but in general that is too much for the street. I think 8.1 - 8.5 dcr for a street motor is more reasonable. That probably puts you at 11.5 static or less. Unless you plan to run higher octane (expensive) or pull a few degrees of timing (hurts power) you better get a different piston. I think Lunati makes a -20cc.

Rick