My 71' Roadrunner originally came with all drum manual brakes. I already have A-body spindles and can do the disc swap easily.

I work at O'Reillys and can actually get a power brake booster and master cylinder together for my car. My question is are there any other parts I would need to do the swap? IE like is the brake linkages the same lengths between both setups?

I did the swap on my 72 RR and the only surprise was the bracket that is mounted behind the dash as it has two studs that interfere with the mounting of the power brake booster to firewall. Dont forget about proportioning valve and most of the brake lines.