One of the best sources for these conversions is ABS in Orange, CA. They also have a shop where they install these conversions so they have real world experience. The conversions using Corvette MC's can be set up for disc/disc or disc/drum and with residual valves.
These guys can tell you what type of a system is best for your vehicle.
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