71 Scamp Disc Conversion ???

Do you have SBP wheels now and do you want to keep them? If so then you might want to source a Kelsey Hayes setup. If you plan on going LBP in the future, then go with The 73-76 disc swap which is very popular but does use LBP. Find a set of adapters for the rear to convert to LBP until you can find a LBP rear end.

EDIT: Hemi71x just posted a set of rebuilt KH calipers should you decide to go that way