Any B series motor would drop in there. I would suggest, obviously a OBD II motor and ecu combo. If you still have the tranny, and B16, B18, or B20 would work fine. I'd suggest a B18C1-- more power than stock, but looks stock. For a econo swap, find a LS engine a B18B1 and drop that in there and sell the car. Some kid would buy it. Only 18 hp less than stock, no VTEC, but a bit of torque.

Good Luck

Jung