Swapping 6 lug rear on a 85

[lowhoe]

Im looking to convert my 85 to 6lug. I already have the front end taken care of thanks to early classic. For the rear I have come across a 6 lug rear with dics that has already been narrowed 4.5" per side. I plan on running a 24"x10" wheel with either a +12 or +32 offset. I know the 6 lug rear before being cut is alittle wider than the 80's model rear. Im just worried that the 6 lug rear being cut 4.5" per side might be a little to narrow even with running a 24"x10". Anyone have some exsperience with this situation, or know how much wider the 6 lug rear is than the 80's model rear? Any info would be a help.