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Don't forget that big C.I. motors eat big duration cams and need big air into and out of them


Something around 265-270 at 0.050" cam and 0.600" lift would be streetable at 512 CID. CR depends, but 11.0 should be safe with aluminum heads, and the right setup (quench, duration, ignition curve, etc) could push 12.0 CR; but that can get touchy.

Check on that 4200 converter. If that was the stall with 440 CID, it will stall higher at 512.

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1