May I make a suggestion? Check with your rim supplier to make sure you can get a 6 lug rim with the proper backspacing in a 16" diameter with your choice of tire size. A 65" diff may present problems.
I just went through the process with my truck conversion to an open drive and suggest you look ahead to a front disc conversion that you might want in the future and rim problems you might encounter.
My truck stock diff was 62" from wheel mounting surface to mounting surface so logically I went yard hopping for that width. That width would require me to use a 4" backspacing on an 8" wide rim to center my tire in the rear wheel well. On your setup, with a 6" rim on 62" you would use a 3" backspacing. No problems so far. However, add another 1-1/2" to your diff width (for 65") and you'd need 4-1/2" backspacing on a 16X6" rim. Hopefully, you'll have better luck than I did on finding this rim configuration.
Ultimately, I had to shift gears and take a look at some other configurations and went with a 62" diff (3.08 R&P)from a 70-80"s Camaro, 5 lug w/15X8 rims with 4" backspacing and a fat BFG 255/70/15 that are 29"tall. This centered the tire width-wise in the rear wheel well.
Have you thought about the front end? If you're even remotely thinking about a disc upgrade on a "driver" the 5 lug conversion is IMHO a much simpler/cheaper way to go. The 5 lug uses Camaro rotors and discs. The 6 lug uses your old hubs minus the drums and you'll wind up springing $120. for the replacement roller wheel bearings. The Camaro bearings from CPP are $30. and you can get all the replacement parts from your local parts house.
I'm running a 15X7" w/4" back spacing on this front setup with a BFG 235/70/15 needing no wheel spacers and clears the stock tie rods on the inside by 1". Upgraded tie rods would give you even more clearance between the tire.
The only downside of going from 6 to 5 lug is that you probably aren't going to be able to use the stock hubcap setup.
You can duplicate the tire height, have the tire/rims centered properly and have fewer hoops to jump through with the 5 lug conversion but it's totally up to the individual which way he decides to go. I just wanted to show you an option that was viable, looks good and is being driven on a daily basis.
I went through 2 months of trial and error chasing diffs and rims to get it right and hope that this may save you some of the headaches.
Dave
