RBS stocks a large line of carburetor adapters and here is an example for the hot rodder that wants to build a era specific 70's thru 90's era hot rod or race car where the shiny billet of today won't cut it amongst the purists.
This carb adpt. starts off from a heat-treated alum. casting and is machined to fit all 6-71 thru 14-71 blowers allowing you to mount two 4150 carbs a top your supercharger side saddle or two Edelbrock or Carter carbs inline. The adpt. includes hardware to bolt the adapter to the supercharger, as well as two 4150 carburetor gaskets plus a screened inlet gasket that keeps harmful debris out of the supercharger.
Center to center of supercharger bolt mounting bolt holes are 13.250" and center to center on the carburetors are 8.625". Carb. adpt. thickness is 1.125" and will give the top of your blower motor some serious attitude.
Once these are gone there are no more so make sure to get one before it is to late and you miss out.