IIRC the Holley 1920 360 2bbl has a bigger airhorn than the other 2bbls so your 2bbl Carter dual snorkel air filter housing will not fit it, which, sucking hot underhood air, is no big deal anyhow.
The 2bbl single plain off a 71 Demon 318, as already stated and offered, is a great solution, with 302 heads.
The 1920 carb has a whole raft of problems that will likely take you several hours to work thru. But after that it will be gangbusters. Well it would be if your 273 needed it, or could figure out how to use it. The 1920 does not fit onto the demon intake as received. You would have to make it fit.
