So your intake Outer Diameter is smaller than the car OD? Is that what you're saying?
If that's the case, I'd you can weld, find a piece of pipe that slips over the intake that's roughly the same OD as the carb, and cut and weld a shim onto the intake.
If you can't weld, if you can find a brass bushing that is a very tight fit on the intake, you can hammer it on (or braze it on if you can.)
You might be able to find a stepped heater hose that fits at an auto parts store, too. (made for joining a large pipe to a smaller pipe.)
Last ditch effort would be using a smaller piece of hose as a shim, but that'll probably leak, or your carb will fall off.
Best would be to ditch the MLM intake and find one that fits