318 power?

Displacement doesn't produce horsepower. But it does produce torque. That's the thing you feel. Hp is just a calculation.
A tractor engine produces torque. lol
and with a 4.03 bore you can't get enough head to match a 4.32 bores ability.
I don't think my Indy 440-1 head will work with a dinky 4.03 bore. lol