The brown plug is located directly above the ecu/behind the glove box. All the colors should match up.
As far as the heater hoses go....
http://srownersclub.com/faq/index.asp
Thats the link to Heavy Throttles S13 swap guide. It shows all the heater hose info you need.
For more wiring info go to....
http://www.frsport.com/SR20DET....htmlThat has all the wiring info. Between these two sites and some mechanical ability, the swap should be a cakewalk.
goodluck and let us know how it goes.