a swap itself isn't nec illegal, but it may not be considered emissions compliant if the person running the emissions is a hard a$$ and knows what the engine is (more than likely you won't run into that). is your chassis obd1 or obd2? if it's obd1 i can socket/chip and tune the car and it more than likely will pass the sniffer test as long as you have a cat on it and working o2 sensor. if it's obd2 then use the b20 computer. since it's non-vtec and if you have a cat plus primary and secondary o2 working you can more than likely get the ecu into readiness w/o throwing any codes and pass.

good luck.