The starter mounts to the bellhousing on your truck. It would use the same flywheel for the 350 providing it is the earlier engine as mentioned previously. The dampener would be larger on the 350 which may require some pulley changes. You will need to use the short water pump that came on the 283 to line up the pulleys and give the correct clearance between the fan and radiator.
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