Offenhauser 2@ !bbl Holley swap info

Quick question:

Has any one here done the offenhauser 2@ 1bbl Holley intake conversion? I just bought the whole set up including brand new carbs in the packages (Holley 1920) and the linkage set. I am looking for another 1bbl unsilenced air cleaner if some one in or around Connecticut has one for sale I need one. I'm just looking to kinda get a heads up on what to watchout for with this (laughing) high hp bolt on item.

Also looking at a new cam - any ideas on who but Comp cams makes Slant six camshafts?
I'm thinking a 800rpm - 4500 rpm range like 270 duration and no more than .420" lift. I still have the stock gears of 2.76 in a 7.250 rear. I am not looking for a huge lift just a bit more than stock. I have heard too high a lift / duration in a /6 and they sound like a air popcorn maker.

Thanks,
Joe