NEW Forum Group, SO-CAL Mopars

Jim Lusk said
The 7-1/4 will NOT hold up, long term, to a 340 or 360. An 8-3/4 is your best choice, but an 8-1/4 will work if that's all you can find or afford.

Alright thanks! I will defiantly make note of that when finishing up the car!