if he leaves the wiring harness on the 3.5 oe 3.2 then it is plug and play if the years are 98-01 or 02-04. If you take the 03 and try to use it in a 99 thenthey are not plug and play.so a 98-01 2.7 and 3.2 are the same connections and the 02-04 2.7 and 3.5 are the same connections. Yes the ecms will work just fine.
Swapping a 3.2/3.5 inplace of 2.7 ?s.
