The issue with a manifold and either progressive or solid linkage has to do with if the carbs feed individual groups of cylinders or if the air fuel mixture is joint.

If the manifold were arranged such that a single carburetor barrel fed a single cylinder, then solid linkage would be mandatory; does not sound like this is the case.

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Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop