Hey guys I've been wanting to pick a few brains. I currently have a 03 monte LS with a 3.4 with a timing cover coolant leak as well as a headgasket on the way out and oil pan leak. Lots of work I know. I was wondering how difficult it would be to swap in a 3.8 seeing as my uncle has a known good motor out of a grand prix that he said he'd let me have for free. I know pcm and most likely wiring harness would need changed but is there more than that that I'm not thinking of? Any help would be great thanks!