Newbie 8 3/4 rear end questions???....

Also it has chevy bolt pattern in the rear4, 3/4 why would that be,along with other holes in the axles,that i think are 4, 1/2,did some 8 3/4 rears come like this?and front is 5x4,so finding wheels is hard,what can i do to match it up? Thanks...

take pictures of what the heck yo actually have and get back to us.