I think that is also known as a 4.3 V-8. It is the same engine family as a LT-1 used in Corvettes & Impala SS. You would need a flywheel from a late vehicle. You should be able to use a V-8 bellhousing of your choosing.
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