You will need a V-8 flywheel and bellhousing. None of the 235 stuff can be used for the conversion. You can use the SM420 trans. Pick up a V-8 bellhousing from a 55-59/63-67 truck. You may also need the rear crossmember from a TF or 60's truck as the bellhousing mounts to the crossmember. You can get the side mount aftermarket tubular crossmember from a number of suppliers.
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