So, a 383 has bore of 4.25 and stroke of 3.375 and 6.358 rod.
Reduce stroke by 0.275
So destroke to 3.1 and use BBC rods measuring 6.635. (Eagle H beam shelf stock) This is a 0.002" difference from stock current piston pin height, yes? So a 383 piston with a 0.990 pin should work for 351ci?
Or the 400 bore of 4.342 and get 367"
Please let me know if I am wrong.