Why not go with a manual reverse valve body, screws right.up. Absolutely no chance of missing a gear.
Absolute control of the transmission 24/7/7/365. Include a 3500-4000 stall converter , your golden,
If you think in anyway like I do, make it so that you can have assorted hp and still use the transmission .
I would recommend this shifter:
B and M Pro shifter, with a reverse lockout
Edit: Pro Stick