b20z, thats what i would get, great motors.Just get some good cams that engine will be faster than a b16a and makes it at a lower rpm.they respond realy good to bolt ons.And low rpm power equals fun puts you back in your seat and the non-vtec heads have that awsome deep ass sound with an intake. and for the tranny I would just find one localy, people with 2nd gen. integra's are always swaping their engines to b16's.low rpm power makes a differance my brothers old b16 rex got pulled by a ls rex to about 80 then they my bro started to pull and the ls rex stopped.