Splayed main caps on a 360?

All i have is the blower, manifold, carbs and a spare 360 block.

But im getting to the point where i can start spending some money on the new engine build!

Its not gonna be a "skys the limit" build but im not gonna go cheep on it.

The heads dont even really concern me as its forced induction so i would slap my cast iron ones on bit i want the aluminum to remove some heat because the blower will be making my charge air hot!