New guy saying hello.

Welcome aboard, and THANK YOU for your service.

I'm a bit curious as to why you think a 904 won't "cut it". They can be built to withstand high horsepower applications and they are far less of a drag on your horsepower.

Yeah that's true, but here's the deal I already have a free 727 rebuild kit (which I found in the back of a junkyard Ramcharger) it also has a no yoyo kit.
The junkyard is selling ANY Tranny for $125.00
So I have several choices.
A727 (Cheapest to rebuild)
A904 (Less drag+not as cheap to rebuild)
A518 (OD+definitely not as cheap to rebuild)
A500 (Less Drag+OD+not as cheap to rebuild)

Source: http://www.makcotransmissionparts.com/Chrysler.html