The 4wd rear end is the proper width...if it matches the bolt pattern you plan on using. The correct width of the stock AD diff is 62" from mount surface to mount surface.
I've found that the mid-80's Camaro diffs are plentiful and cheap and if you are looking for a 3.42 or a 3.08 there are readily available. However, they are the 5 on 4-3/4 pattern.
When you retain the original 6 lug pattern and convert to front discs, you're going to be forced to buy the pricey wheel bearings for the stock hubs....only available from the mail-order vendors. You're going to wind up with rims with 3-5/8" to 4" backspacing.....might be an option to consider and be able to replace bearings/seals from your local parts houses.
Dave
