Lots of vendors: Patrick's Antique cars/trucks, Speedway motors, Chevs of the 40s, they all have multi carb intakes. Finding three matched Rochesters will take some shopping, swap meets, ebay etc etc.
Good luck


It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed