'70 Chrysler 300 8 3/4???

I would say that the 8 3/4 is a 1000 times better.
I have heard/read from alot of people that a stock 8 3/4 will handle 500hp no worries. So down the road when U upgrade to a stroker V8 and the rear will be there. If you have to disassemble the rear you could go ahead and weld a brace on it then that will be done also. Overkill for now but plans always change without warning.