Corrections are in order here:
New 360 block, plus oil pan, plus crank, plus pistons,
will cost more than,
crank & pistons. Even with mod cost to pistons, which is basically free for me.
As for calculations:
Stock 318:
9.64" block - 6.123" rod - 3.31"/2 stroke - 1.822" piston = 0.040" in the bore
Stroker 318:
9.64" block - 6.123" rod - 3.58"/2 stroke - 1.658" piston = 0.069" in the bore
or is my calculator broken????
