Which K-Frame to use?

hey everyone...

I just recently found a killer deal on a 73+ disc brake setup. Paid a $100 buck for the the complete K-Frame minus torsion bars. The brakes will be going on my 70 /6 duster that i've done a V8 swap on. So my question is which would be better the /6 K-Frame or using the 73+ V8 K-Frame. They both have to be gone through with all new bushings and what not so thats not a problem. And the cars gonna be going to my buddies body shop here soon so i'll be dropping the assembly to redo.

Thanks

Mopar to YA...