Bob,
The common PS conversion for your year model truck is The saganaw
box from a 67/87 Chevy/GMC pickup. Several aftermarket suppliers sell the mount kit.
The Toyota box can be used on the earlier (TF) trucks as the sector shaft comes out the side like the original.
The 64 sector shaft comes out the bottom.
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