Will a H22A that come off a 2000 Prelude fit in a 1990 Prelude?

Yes the H22 will fit in a 1990 prelude. It is a very tight fit and requires modification. You would need a new transmission, ecu, new wiring, motor mounts, ect. Before you decide to do this swap you need to really think it through. Its very costly, difficult, and can be troublesome. And remember this is all for a 60-65 hp gain.