i have a 85 indy 400 for my son. and my father in law has a 93 indy 500 that he just had a xtra 10 rear end put in it. he said i could have his old one to put in my sons. but since they are both a 8 inch would the 93 be any better then the 85? or would it even be worth it? not sure if they are the same or not since they are 8 years between the 2.