As someone who has worked with n/a 4g63 and the 4g63 turbo motors ....just get a n/a from the wrecking yard and drive the piss out of it!!
The up side to n/a 4g63 is that they dont have such a high risk of over heating as the turbo's .
Says the dude who has ran a colt with a n/a 4g63 in rallycross for a year and a half and ran combo car for one event.
The biggest problem with the talon/DSM's is not anything with the drivetrain its the simple fact you cant see out of them.....like you are in the bottom of a bathtub.