The 210 model number threw me off, I thought you were referring to the cfm.
What's the issue preventing a single adapter? Seems like an aluminum blank block could be drilled for the carb studs and manifold studs. Not just on the Varajet integrated head, but removing the 4bbl plate on the Offy and drilling the adapter out to fit the screws on that too. Maybe even the Monojet heads?
