All you need is the motor (long block) and complete intake manifold with 97 fuel rail.
Every thing else get's reused from your 1.9. Tranny, flywheel, clutch, wiring harness and ECU. Even the oil pan and exshaust manifold can be reused from the 1.9.
You will need a RPM switch to control the split ports, but that's no big deal.
Follow the link in my sig for directions.
The 2.0 SPI has a less hp then the 1.8 DOHC GT motor, but more touq. It will make you just as quick as the GT motor, but a hell of a lot easyer to swap in.