The two-barrel Carter-Weber carbs mount up to Fenton, Offenhauser, Clifford, etc two-carb intakes using the same 2-barrel to 1 barrel adapters.

This is the dual carb linkage set that Langdon sells.

You might have to grind mounting ears to match up the Fenton headers with Offenhauser intake and the intake barrel touches one of the headers (I had to grind both the intake and the headers).

Fenton intake with Fenton headers match up nicely.

Use good/new intake-to-head alignment rings/sleeves.