I've seen a few dyno charts from mopar FWD guys who've built 2.2/2.4/2.5's to put out 450hp down with a hx35, or maybe it was a hy35, can't remember. But 500hp is easy to build a 440 for without boost, and the combo would be pretty mild. 10.5 compression, eddy rpm intake, cam 230-240 @050 duration, headers and 440source/rpm/big valved + ported stock heads.