one question. who the **** buys a pontiac grand am with a 4 banger? i'm still kicking myself in face for getting a straight 6 jeep grand cherokee instead of a V8.
but to answer your question, in reality, it could fit. BUT, you would have to do a lot of modifications to make it work. and unless you're a pro mechanic, i wouldn't do it myself. take it to a custom shop or something, and they'll do an awesome job. even though it still won't be as good as stock.
does a 4 cylinder even move that vehicle?! wow.