B16A1 has 150BHP, the B16A2, found most commonly in the EG VTi and EK VTI has 160BHP, the B16A is the 170BHP engine found in JDM models, the B16B is the Type R engine as said before, this is due to more agressive VTEC cam, pre-VTEC the engine output is pretty much the same as eachother, its when the VTEC cam is engaged the Type R cam means it makes more power due to higher lift.
Another website to look on is Civiclife, and also Hondaevolutions is a site for all Honda owners, and also might be worth having a look on the Integra DC2 forums as you will find many DC2 Integra bits will fit the Civics.. My old EG track car was mainly made up of DC2 bits, including steering rack, brakes, etc etc..