I have an oil bath air cleaner off my 1954 Monarch 256 teapot 4bbl carb. I have installed a 292 with a holley 4150 4bbl in my car.  Has anyone ever located an adapter that will entertain the  oil bath air cleaner onto the Holley 4150 4bbl?
Bert

There are plastic adapters that go the other way...from 4-7/32" to 5-1/8". You will have to modify the base to fit the Holley. Or go paper element with a 57-up air cleaner.