On a Budget? Say No to Rear Disks

Not only will they fit under 14' rims, they'll even work under 14" rims. :)
Sorry, couldn't resist that.

Seriously, I too have to question the value of rear disc conversions on 8 3/4's. in addition to buying a kit made up of mis-matched components, you have to use Green bearings or convert to Ford 9" axle tube ends and use Ford bearings. By the time you add up all the parts and labor costs, it's no wonder so many guys just switch to a custom built 9" with discs.
On my son's car we used a Summit kit, actually made by SSB and it worked pretty well. We did this because he really wanted discs and were swapping to big bolt pattern axles anyway, but I still wonder about the longevity of green bearings on a street driven car.
My Duster has an 8 1/4 with 10" drums and on the next phase build I will probably retain that axle and either use the GC discs or 11" drums. My car is driven a lot harder than his and I want to try my hand at auto cross when it's back on the road.