42RH / A-500 in a Duster with pictures.

Thanks for the info so far, great thread. Is there a build thread, I didn't seem to find one.
I would like to go to overdrive trans. My choices are an A500 (40RH/42RH) or a GM TH200–4R. Preferring to keep it MoPar, and avoid the costs w/ the 200 (adapters, shifter, etc.)

Since the 42RH is essentially a 904, will the Turbo Action Cheetah full manual reverse pattern valve body from my 904 work with the 42RH?

US Car Tool now makes a crossmember adapter for the A518. Are the mounting points for the 518 and the 500/42 in the same locations so I can avoid the fabrication part?

Since the O/D and L/U are electric, I assume my old Hurst Pro-Matic 2 will still work, yes/no?