Get the booster, dual master cylinder, & proportioning valve. It's the best way to go. There are many suppliers out there offering the same kits. Find one that knows something about the product and how it functions instead of ones that just push parts across the counter.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine