1987notchback

i am looking to rebuild/replace my rearend it is on its way out clunking etc. i figure now is as good as time as any to also convert to 5 lug and maybe disc in the rear also. i want to build it right so down the line when i finish my 351 it will be able to handle it. i have seen the kits in late model restoration they seem high in price? should i bother to buy a used 5 lug rearend with disc's or not even bother? i have 4.10's now but i am going a little more highway friendly either 3.55 or 3.73 what do you guys think? thanks mike

1987notchback

i have a set of 17" cobra rims that i am going to put on so i am thinking disc in the rear might look nicer