Lost the brakes in my GTX. I have very low vacuum due to the cam so the brakes are usually sketchy at best but now I have nothing (extremely hard pedal). I believe it can only be the master cylinder or the power booster. All the vacuum lines are OK and I do have an aftermarket reservoir under the battery tray to increase vacuum reserves. Getting ready to dive in so I decided to look for a new power booster in case I need one but I can't find one anywhere for a '70 B body. What options are out there??? I prefer stock-ish look for the GTX but may stray from that if I can find something that will give me good brakes with 6" Hg at idle.