What do you want to do with it, do you want a daily driver good for mpg or a little beast. If you want something that your gonna drive to work everyday, then swap in a ZC. If you want a little beast, then go ahead with the gsr swap, you are going to need aftermarket mounts compatible with hydro tranny setup, shorten your shift linkage or buy some aftermarket ones, 90-93 integra axles, a jumper harness for the ecu and you might need some Si or Dx hubs if its a base model hatch. And if you live in California, you need to get your swap reffed or get ready to pay some tickets.