Hi! I'm having the rear differential on my 68 vert redone at a local shop. I've looked at previous posts discussing gear ratios, etc. I plan on having a standard 400 build with just a little more punch, correct turbo 400 auto, with AC. I'll be doing highway driving and around town on 15" Rally II rims with 235 or 245 60's all around. I know tire height makes a difference. I'm thinking 3:36 or 3:42 gears with a posi carrier. I think 3:55 would be too high. Stock was the 2:56 open. Any huge difference between the 3:36 and 3:42? What manufacturer do you all most recommend? Auburn, Dana, Yukon, Eaton?? Appreciate the feedback!

Forgot to mention it's an 8.5 rear end from a 70's Nova, I believe. I pulled the code from the front of the right axle tube, just don't have it with me at the moment. Thanks!!