if your a DIY'er you could learn how to hack the stock ecu. check out these sites for more info:
www.pgmfi.orgwww.ecucontrol.comwww.turboedit.orgotherwise i would go with zdyne, as they are more d series, non-vtec
www.zdyne.comas far as telling the difference between the ECU's
most 88-89 ECU's came with an internal EPROM while most 90-91's came with the external EPROM, which is what you need to be able to use hondata and zdyne and the other DIY things