if your putting a vtec head in an EK1 civic, you need to change wiring. The D16Y4s wiring is not like any typical OBD2, where an OBD2 has three plugs for the ecu, the Y4 only has two. so, you have 2 options.

1. sourcing an EK4/9 EM1 or even EJ8 engine wiring harness & a Y8/1 dizzy (because the Y4 has some additional sensors in its dizzy, like for instance ignition pulse for an rpm signal). then an OBD2a/b>OBD1 to run a socketed ECU which you plan to use for hondata

2. an EK1>OBD1 harness from edge auto, Y8/1 dizzy, some patience for wiring, etc.

Also another thing, to run vtec with a Y4 block, you need to chance IACV. Y4 IACV is located on throttle body & is 3-wire, whereas Y8/1 IACV is located on back of manifold & is 2-wire, so you also need to get the Y8/1 intake manifold or just go for gold & upgrade to skunk2 manifold.