You can move stuff around, change engines, and install V-8 emblems, it still doesn't make it a real "V-8" truck. The VIN still identifies it as year, model, and engine. However, most people that will look at it either don't know or care what it started out as.
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