Differences in 318 block.

hwy2 said
I have a 89 block with a crack I cannot have fixed. I also have a good 71 block and rotating assembly. Will this older block work. Its std 3.910 bore. Largest bore size I measured was 3.931 what would be a good oversize .020 over?

"Clean up," the '71 block by 0.040" to 3.950.
Get yourself a new 4" crank.
You now have a 392 WEDGE.
Get yourself some of these badges and replace your "V8" badges.