Looking for Some Advice

I plan on getting a more heavy duty rear end, but want to keep the 5x4 bolt pattern that it currently has. Is this possible? And what would be the easiest way to go about doing this? Any help is appreciated.

If you go with an 65-72 A Body 8.75, you’ll retain the 5 on 4 pattern. Just out of curiosity do you have front drum brakes with the 5 on 4 pattern? I suspect you do since you’re asking about retaining the 5 on 4 in a HD rear end?