All factory Big Block GS Stage 1 's had power Disc Brakes Mandatory In 71 an 72........................
When I was looking for a car, I realized I had to avoid the 71’s. I like them, but I just don’t know enough. The 72’s were much easier for me to verify, and I didn’t want to get burned..just my advice. You may be a subject matter expert like many on here, I dwould of been gambling.