Rear end swap to an 8 3/4

73-76 a body 8.25 would be a direct fit --have the 4.5 bolt pattern-- make it a sure grip & your all set.
8.75 is small bolt -- so you would need mods to use lbp wheels
as for wheels you need to get the rear in first then determine what off set will work-- there are threads on max wheel/tire for most cars-- not sure what you car is.

do some searching-- then hope someone within driving distance has what you need shipping will add $$ to this deal, Lawrence