8 1/4 rear end w/ SBP & drum brakes

Thanks for the replies. Yes, I knew it would certainly require getting a new drive shaft made.

I was going the 8 1/4 route because I've heard 8 3/4 can be very difficult to find. The reason I wanted sbp is because I have that in the front and don't want different pattern in the front than in the back. I suppose I could change the front over to disc bbp, but the money... lol