Be aware that many of the kits that are offered the calipers will not clear the stock wheels. If the supplier doesn't know, go somewhere else. There are numerous kits available from aftermarket sources. Also, there are probably dozens of posts on this site on this very subject. Read the posts and obtain a good understanding of what is available and who provides the best technical services. Many of these suppliers just ship out parts and are of no help when you have a problem.
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