^what he said.

My ‘68 had the manual single piston front disks when I bought it. I added the the power booster and master cylinder from SSBC back in 2004. After my engine build, I only make 11 inches of vacuum with my cam, but the booster does make a considerable difference. I actually just replaced the booster and master cylinder this past Monday. A amazing how absolutely nothing is a “bolt in” for our old cars. I had to shorten the master cylinder rod(?) as the long rod was 1/4” too long, and the short rod was way to short. Also had to cut the the brake pedal rod since the pedal was about an 1-1/2 too high. Be prepared to do some modifications.

When I push the brake pedal, the car stops. Every time. If I push the pedal hard enough, the car screeches to a stop. Not sure how much more stopping power is required.