Here is our S.c.O.T. Italmechanicca adapter for the original superchargers of which do not have provisions for mounting two three bolt carburetors as the one included in the photos attached.
This adapter plate can serve two purposes. It can be used to mount tow three bolt two barrels (Stromberg 97s, Holley 94s) to your supercharger, or it can be used to mount out 3 carb adapter to the blower. Both examples are pictured above.
The parts are carved out of 6061 aluminum, and hand polished.