My brother-in-law just through a rod in his 93 civic 2dr. [I] have been working at a honda dealer for some time, but never really got into which engines are interchangable with what. The civic sais EX on the back, has a sunroof, but has steel wheels with covers, and no vtec engine. which engines can i easily put in this, besides the one that is in it already, without major wiring or pcm changes?