If you have both cars it will be alot easier as you will have all you need. Just pull the entire motor and wire harness form one and transfer it to the other. swap ecus, cluster, and dash harness. IIRC motor mounts, ecu pin out, harness, dash cluster, are all different from 87-88 and 89-92; then you also have all the differences between turbo and N\A such as ecu, wire harness, sensors, transmission, differential, exhaust, ect.... It will definatly requre some serious time and work but will be well worth it in the end. Basicaly look through as many NA-T builds as you can to see all the finer points of what you need. Good luck!