My 55 Olds uses the same carb. The factory spacer is nothing more than 4 carb to manifold gaskets stapled together. 4 gaskets with a bit of permatex between them would work just fine........Bob
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Bob Beck
39 Chev PU
69 big block Corvette
55 Buick 66C
57 Buick 46C
55 Olds S-88
56 Chrysler St. Regis
AACA, BCA, WPC, USHGA