there is some guy in Florida with a Plymouth arrow with a 3.8

there is the 3.0

the 3.3 which is a dodge variant

the 3.5

and the 3.8, another dodge variant

you can find these motors in all sorts of engines, but the guy in Florida had to run a triple row radiator because he kept blowing gaskets, and he actually has fans spaced out so that it cools the block sides a bit better. but these motors usually collet 200 to 300k miles. you can rebuild one, bore it out and all for cheap.

but I would go with the 3.0 or 3.5 because its an OHC design, the dodge versions are OHV with the cam in the block. the Mitsubishi engines come in 24V versions too, and have plenty of upgrades.

I have a 3.8L in the shop right now, it needs a new bottom end, a valve cover and an upper intake manifold. if you are interested I can give you my number and ill call you back when I get a chance to do something lol