If we're still talking about the D15B VTEC, it already has a VTEC head on it.
You could put a z6 head on there no problem, however, a y8 may be of some difficulty, and there may be some slight modification/fabrication needed. I do not recall the differences offhand. A Y8 head however, would be the ideal choice. I really would like to turbocharge one of these motors. :/