You will also need to shorten the driveshaft, change the front yoke to the fine spline that auto transmissions use, install an oil cooler & lines, transmission kick down cable/bracket, and either modify the column shifter or use some aftermarket shifter.
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