70 dart rear end and brakes oregon

There are different 8.8 rears. Mustang 8.8 are different than Explorer. What is yours out of? Most folks here in the Portland Area want big bucks for an a body 8-3/4.

Have you tried Wild Cat Wrecking in Sandy Or? They are all Mopar and may have one or a 66-67 B-Body one. A 73-up 8.25 might be an option too?

What kind of use and power level are you looking at running?