Aside from getting everything physically mounted, and the mating of whatever tranny/ rear end setup you go with, the next big hurdle will be the electronics.

If money is not an issue, AEM would probably be the best supported online, with tons of basemaps and wiring diagrams everywhere. Least headaches with this option.

If you want to learn the intricacies of what goes on behind the scenes, go megasquirt: http://www.diyautotune.com/catalog/m...led-p-435.html awesome unit and maybe $150-200 in harness and sensors and extra stuff after that. Might end up costing about the same when you factor in getting a basemap made and the time it takes to figure it out. At the end of the day, you'll be more comfortable with messing around with it yourself with the tuning manuals/docs available online.

Or you could just use the OEM computer and harness if available and plug up a piggyback when you need it.

This writeup might help, not sure how accurate it still is though: http://www.2jzswap.com/vbulletin/showthread.php?t=2397

Off hand, I do remember decker1.8t did a 2J swap on an S14, as did a bunch of others I can't recall.