I'm thinking of possibly trading my 65 Dodge dart GT blown 440 for a A body or b-body four-speed.

I've got a Dana 60. I've got to get a shortened. I was going to put in the car with some 354 gears cuz I'm running 28 tall tires as well but I like the looks of a Dana in an A body
I've got a Strange Super 60 in the Valiant. 430s. But it's got a spool. Race car only. No need to spend the extra money for a locker.