Hey guys, 
 
Just looking at the possibility of going down this path, just wanna know what I'm in for if I do.
 
Thanks!

Search on MR2OC for the guide. I once did this exact thing a long time ago but I can't remember much of what I had to do. 

Going from memory....

Gen3 map sensor, intake air temp sensor, manifold temp sensor.

You can use the apexi map sensor, and you can use the gen2 ignitor i think but you need to change the dwell settings otherwise it wont rev over 5500rpm Ish properly.

And either a patch harnesd or repin the ecu plugs, along with running new wires for the iat and mat.