I'm fairly certain its a completely different engine.

Best thing you could do is go hit up craigslist etc. for an Intrepid with a blown 2.7 and swap the 3.5 out of the LHS in there. It's much easier than you think and you end up with a cheap version of the Intrepid R/T. Bolt in and plug and play.

So many LH cars have had 2.7's blow and they are cost prohibative to fix. Go get a price on a used 2.7 engine from a junkyard. Yowza!! You can typically find a fairly mint 2.7 car with a bad engine for under a grand.

I have an '01 intrepid with a 3.5 out of a 00 300m. I was going to fix the 2.7. The swap was easier.