I had mine redrilled for 5 lug several years ago. Of course the drums need to be drilled to match and new studs are required. You also need to trim off the material from the center flange in excess of where the drum mounts to the axle. The 5 lug wheel has a smaller center hole and will not seat properly.
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