K20 swap into an EM2 is going to be pretty straight forward. I would be concerned about which header will fit, and if you need to do anything about axles. you might be able to retain power steering, and AC, but it could be a mess.

I'm guessing a lot of RSX parts will work, since the EM2 is the same platform. have you dug through the forums on K20A.org?

oh please tell me you have a K20A2 or K20A, and not an A3...