The key thing to remember when converting to a V-8 from a 235/261 6 cyl is that nothing from the 6 cylinder can be used in the conversion. You can use your original transmission but will need a V-8 bellhousing and flywheel. It would be a good idea to locate a complete V-8 with all the accessories. Front mounts are also required and available from aftermarket 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