Originally Posted by t3rse
first off, the evo is the only logical solution, although parts aren't cheap. There's no reason you can turn the motor 180 for 1&2 g trans (modify oil pickup or better yet dry sump and a few other interesting "fixes").
1g dsms are much heavier than 2700# or whatever you said. The smart solution there is to put a 1g drive train into an 89 mirage, which has been done and has been proven to be capable of low 10s on street tires.
an option no one has considered is the 91 isuzu impulse RS. awd, turbo setup like ours with a 1.8L engine, and have been in the low 12s so the drivetrain is a least somewhat beefy.
If you use an EVO VIII trans - it's already facing the right direction. Mitsu turned its motors around the "US" way on the VIII. Just make an adapter plate to reun an EVOVIII trans. It's THE easiest and most logical solution. As for the rear, you could adapt an evo rear or any 1 or 2g DSM.
The hard part of the job will be fitting the AWD transfer case around the K-frame and getting the trans lined up so that the driveshaft runs through the tunnel TD's already have. If you have some $ - probably around 5 grand - a garage - some time -= and wleding skills - you could do this.
Now, as long as we are talking about crazier swaps, another option would be a custom K-frame (like the RWD k-frame exline makes - in fact that one may work for this idea) and a TD motor mated to an audi quatttro 5 speed. It's a longitudinal design, so it would be like a RWD layout only it would sit farther forward. This would probably NOT work in an Omni but it could be done in any other TD (including charger - because you can cut the front end since you have a nose cone to work with). The same applies to subara, its the same layout and you could do the same thing. It would even fit in an omni IF you used the subie engine. However, unless you buy the STI trans its not a good idea. The WRX trans is junk.
All of this is just theory of course. The fact remains, the only REASONABLE method is an EVO VIII trans. It's not the only way, it's just the BEST way.
Ont he sdame note - if you just wait for the new turbno wolrd engine from the SRT caliber - it "should" mate to the EVO X trans which is ALSO facing the right direction. Time will tell though. Although they are a shared design, its possible mitsu or chrysler could change the bolt pattern on the block. You could also swap in the enire EVO X drivetrain. However, it would be a mitsu designed version of the world engine then which means different head work, different VVT and a 2.0 instead of a 2.4.