Answering your question directly, using the 2.4 as Toasty said, along with all of it's EGR stuff, and the 2.4 electronics, will bring a big smile to the government sniffers. Upgrading to FI instead of carb will make an easy inspection. Bonus for you will be better mileage and power, ease of finding issues as you'll be able to plug the ECU into a puter.