The shift levers used on 4 speeds from the 60's are similar. They bolt flat to the side cover the same way as your Saganaw 3sp OD.
As Cletis stated you will have to modify the shift arms as the distance betweeen the shift levers is greater. I may have some shift levers that will work, send me an e mail.
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