ColbyG, another inexpensive option would be to get a newer stock GM spread bore manifold designed for the Quadra-jet carb, the manifolds are a dime a dozen and you could get the manifold/carb set-up from any smallblock chevy. It would not be period correct but it appears as that is not a major focus.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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