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Will A 03 Pacifica 3.5 engine fit in a 300m. Engine went out in the 300m. Found a one for a good price. Thanks

Maki,

I don't know the ans to your question but I do have a few observations.

Engine swapping ain't what it used to be. In addition to computer controlled engine management systems you now have variations in wiring harness/connector configurations in addition to any number of sensor selections.

What I'm saying is, if you are bound to do an engine swap make it an exact 300m for 300m engine swap. Anything else and you risk a headache you can't get rid of.

BTW: your question is in the wrong forum. You might want to sort that out before going much further.

Pacifica came out for 04 and is different from a 300M engine in a number of ways. Best bet is to stick with an LH car such as Intrepid, LHS, Concord, or M.
What year M ? 99-01 early gen/02-04 different gen but can be modified to work cross years.