2bbl /6

I finally talked my Dad into trading his ol Mercury Montego for a Duster. It is a pretty nice car and runs great. We are going to put a 2bbl on the 225 and were wondering are the heads the same on the 1 and 2bbl motors. Also it had two intakes in the trunk an aluminum 2bbl and an iron 2bbl intake, is one better than the other?