A-Body 8.75 Value

I wouldn't give 500 for one. By the time you pay somebody's gold plated 1000 dollar price tag, you couldda found a C body 8 3/4 and cut it to fit, or a Ford 9" or 8.8, or even a Mopar 8 1/4. If they want more than 500, let um hold it.
So axles, a good gear, and a sure grip are free? Go ahead and buy a C-Body rear, axles cut down or buy new, new ends, new bearings, weld it together, buy the parts you need to finish it, then post a price. I guess your labor is free too...