Will a 1999 chrystler 3.3 liter v6 fit in a Nissan
Nope. OK, well, you could get someone to "custom fit" the engine but it will costs upwards of 5-10K.
ANYTHING can be made to fit anything, but is it really worth the cost and effort? You're not just swapping an engine, but the entire drive train and harnesses, computers, exhaust, not to mention fitment issues with frame, engine accessories, battery, etc. Huge headache for minimal gain.