http://www.thezcresource.com/html/zcbook.php
http://www.hondaswap.com/swap/viewer.php?id=49
http://pub143.ezboard.com/bhondadseries
http://phatwhippincrx.20m.com/photo6.html
http://www.dlaffitte.com/zc_turbo.html
All of those sites are worth checking out. I was going to go ZC with my si hatch, but decided i wouldn't be happy until a built b18. As far as getting the d series from an 89 integra, thats probably not what you want. If I remember correctly, that engine is designated a d16a1. I know my sohc d16a6 (comes in Si's) outperforms it slightly. A true ZC motor (from japan) puts out about 128 horsepower, and IS a direct drop in for 4th gen civics and crxs. That 89 teg motor might not be.
I used to know a lot more about this, all of this info I found by never ending google searches.