Guys in the states are swapping 3.0L and 3.5L engines into Avengers with no problems and boosting them, but as Nick stated hood clearance and oilpan clearance may be issues with 2G DSM's as well as engine mounts and a complete rewiring of electronics. Plus why would you wanna swap anything in place of your 420a? I thought you just did a tranny swap to Manual? What makes you think that the manual tranny will work with any engine that you swap in?

I ask that you please go to www.2gnt.com or www.aseclub.net and do a search or two, engine swaps have been discussed in rediculous detail there...