what rear would you go with

I'll jump in here.
I would go with a 3:54 geared Dana 60.
Why?
The car is mainly for looks, and nothing looks better than a Dana under the back end of a Mopar.
The car obviously isn't built for economy and driveability anyway with the 509 cam etc, so why don't you just leave it as is or put a Dana 60 under it?
You'll never break it, and it looks cool.
That is literally what i am doing, as a matter of fact.