The calipers will rub on the inside of the stock wheels where they are welded (or riveted) together. Later factory wheels and aftermarket wheels are designed differently and allow for more clearance.
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