Hey people, Just joined and need some help. I'm getting there in finishing the 64 fastback 5 years now, and now that the engine is in and the body's on, need some advice. I want to run power brakes. With the 460 and 4.5" valve covers, I hear booster size is important. MP brakes makes a couple that are dual diaphram and either 7 or 8 inches. What have you all done with yours? I've even heard of a corvette one that works, early 70's or so. Thanks.