"It won't be a racecar",.......in no way would I stick an A833OD in that car, I ran one in My ex-Popo Dippy w/4.89's & didn't like it at all. It's a good trans, but from a run-it hard perspective, it's a 3-speed with OD plain & simple.
If it won't be a racecar, & I'm assuming an 8.75" rear, I'd put 3.55's in it for most local driving/cruising for fun & toss 2.76's in for a cross-country haul & be done with it.
I'd love to tell You to go Passon A855, but that debacle makes that an "at Your own risk" until proven over time to be otherwise, sorry to say. I'm glad some Members have had some good recent experiences, but matthon's cannot be disregarded just because of those, so I am sitting on the fence atm.