90 over 318 Head Gasket info needed !!

What displacement do you end up with a 318 bored 90 over? Then adding the 3.20 stroke crank, what do you have? Is that a shorter stroke than a stock 318?
Crank is special
Bob Glidden unit from late 1978
It uses small journal Chebby rods machinist is using a 6.200 H Beam and custom pistons to be ordered soon just getting started with shortblock
321 CI on the build
Super Stock class Im running in is 9.5 lbs per Cubic inch