I'm changing out my 3:73 for a set of 3:08's my 350 turbo does fine and works great behind my 350. I'm also staying with the 6 lugs. I found a place here in Iowa that sells ring gear and pinions for my 12 bolt at the price of $165.00 and the master install kit for $95.00 thats the cheapest I've seen.
WWW.uspowertrain.com