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The B16A from the 89-91 civics had 158 Ps, ran a 10.2:1 compression ratio, had a cable clutch. There was one JDM B16A1 that had the 1 at the end, it was from the first rex's, and is very rare. after 91 the B16A ran a 10.4:1 comp.ratio, and that accounts for the slightly higher Ps. In the US in 93 the B16A3 showed its face in the Delsol, but had the 10.2:1 comp, and produced 160Hp, in 99-00 civics they only difference is the OBD IIb components. All the Japanese motors lack the number at the end of the code. Also as a side note, motors including B, H, D series had numbers at the end in the most of the world, so people maybe trying to pass off B16A1's, B18C6's, B18C4's, etc... and what not as JDM.
Anyway stay with in your OBD level and you will hve a decent time swapping out the motor, to idenify the 1st gen B's they have white plugs, this being the easiest way to tell, since other appearance items can be changed easily, such as intake manifolds, vavle covers, etc...
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