Rear end for the Wagon

A guy here in LA is asking $75 for a rear out of a 66GT with a slant. I asked him if it was a 7 1/4 and he has no idea. My 7 1/4 is making a lot of noise, I think it is a wheel bearing.

He did not know what to charge for the rear, is that about right? Would it make sense to replace the whole rear end, and how hard is that to do? He said it worked well but was replaced when the car got a V8.