Okay, I did some research. A company
www.nolimit.net has drop spindles for 1963 thru 1970 #6370DS or 1970 and 1971 7172DS. I believe these are 2-1/2" drop. Then you add the 12" disc kit with the 5 on 4-3/4" bolt pattern #ED6072-5. I think these use the common Nova/Camaro rotors. Lowered and matching rear disc setup.
