I think you should stay with your existing kit as it is a proven system for AD trucks. The Toyota box mounts on the inside of the frame and since the AD frame is narrower than on TF trucks you will more than likely have clearance problems with a V-8. It may work with a 6 cyl but I have not done one.
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