I upgraded my FFR to power brakes, once the body is mounted there is a clearence problem. Even a 7" booster will not fit with out modifying the frame. So I went the way of the Buick Grand National electric booster. All the necessary parts and a discription with pictures can be found at
http://www.ffcobra.com/FAQ/brakes_gn.html
PS autozone was half the price of NAPA