1971 Demon Rear end upgrade

The question now is this from Dr Diff, anyone know the answer to this question?

I'm not sure the 11.25" Explorer rear disc brakes will fit inside a 15" wheel with 6.5" backspacing.

Wilwood 11" rear disc brakes may fit. See the link below for a wheel clearance diagram:

https://www.strangeengineering.net/...WC-Wilwood-street-brake-kit-11-inch-rotor.pdf