I asked in the other thread, but I'll continue this here. I'll assume you're putting like a 1991 Si motor in it. Your ECU will handle it, but the connectors are all different. To be in for the good haul, you should bring over the donor ECU as well. Also, the wiring is run through a significantly different path.
I have both the 87 CRX D15 (EW4) and the 91 Civic D15b3 if you need any side-by-side comparisons.
But we can get you into a more worth-while swap. For both performance and economy.