You still don't get it. Research on 2gnt.com then. It has been discussed over and over again the difference between the neon 420a and the eclipse 420a and why eclipse owners can't just get a neon 420a and put it in their car. Plain and simple is hasn't been done atleast I'm not aware of it. So if it hasn't been done we can't tell you if it will work or not but hell you seem you want to do it and fail to see what we are saying. So then go ahead and try it and let us know how it goes. Don't see why you want to go through the trouble of swapping engine's... these cars aren't Honda's. Like Amit stated just turbo the 420a.