7 1/4 to 8 3/4 info needed

I say you have 2 options, find and build a nice 8 3/4" or find a cheap local 7 1/4" and just swap that in!!! With patience and a little luck, you can put together a nice A body 8 3/4" rear on the cheap, complete with a suregrip in it!! Start keeping your eyes and ears open for deals on 8 3/4" components!!