You may want to rethink changing to the 1/2 ton disc brake conversion. For the most part 3/4 ton trucks have great brakes, the weakness is the master cylinder. I have done several power brake upgrades on these trucks. A booster and a dual master cylinder will do wonders, is more cost effective, and you won't have to run different wheels.
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