Since you don't have the original engine and the current one runs ok, why not leave the 4 Bl carb and manifold. Otherwise you have to find a 2 Bl manifold, carb and air cleaner. You might look for a 57-58 passenger car 4 bl air cleaner. They are fairly expensive as the the guys doing a correct restoration want them. Most people that look under the hood don't know what was stock anyway. 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