4 Link vs Spring Relocation? Pros/Cons?

Looks great rocco!

I think I'll shoot for the 10.5s. Thanks for the advice and pics!

Oh one last question:
Will comp leafs give me a lot of wheel hop with 300-350ish HP? I don't want to hop and lost control while driving. I know the design of them will bend and force the rears upward.

No, the springs are designed to handle high horse power. Your HP level is below stock big block people mover engine. Never mind the actual HP big blocks that were used. The MP S/S springs are called that for a reason. Think! "SUPER STOCK" should bring to mind a class of drag racing (1970's) that the springs are designed for.

So how much power will the take and perform? Good question that I can only answer as, my very good friend raced his fully ported Indy headed, roller cammed 500 cube stroker on a really nice effort, full interior '69 Dart, all steel except the fiberglass hood into the mid 9's on Super Stock springs pulling the wheels off the ground every launch. Considering the full weight of this beasty, there was a lot of power to get the wheels up and moving it into the 9 sec range.

All on Super Stock springs.