Converting back to OBD I is relatively simple procedure if you use a conversion harness. The biggest problem is it's not legal to have a motor that is older than yoru car in California so you will never pass emissions testing. Also, I believe they hook up to your OBD II diagnostic port when they do emissions testing so if your have an OBD I ECU, that port won't work and you won't pass anyway. OBD2 motors aren't really rare, they're just aren't any JDM one's. People wreck '97+ Integra's all the time, you just have to be patient. I'd personally wait and just get legal engine for your car.