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If changing to a 3 bolt carb type intake on the Merc 255, why not opt for a '55 or '56 Ford 272 Y-Block 2110 (94) carb ? They have the 1 1/16" venturi for more air flow, and the 1956 model had larger throttle bores too (may require boring the two throttle bore holes in the intake though). The 1956 model also had an auto choke like the Merc originally had too.
Sal