I'm a bit of a contrarian. I hear a lot about people putting in the overdrive unit and I'm sure they're happy with it. It's like the carb thing. Everybody was doing the 2 single barrel B&B's, I thought the Holley 94 would be much simpler with equal results. I believe I have gotten that. Positive offset wheels are an option but like you suggest it may make the handling a little whacky not to mention the added load to the bearings. The change to the '73-'76 A body rearend sounds like the simplest solution to me. The advantage gained will be modern brakes and E brake. I don't really feel I will lose much grunt since I have the fluid drive and there is no mechanical connection between the engine and the drivetrain now. I don't do interstate with this car and I am just looking to keep the engine a little less busy on secondary roads.