:rofl:

You will also have to look out at the radiator. in 97 Ford changed the radiator design because the stock 96 radiator was inadequate. I had cooling issues this past summer whenever I would run my AC in my car. Replaced it with an all aluminum 2 row radiator and have yet to have a problem. If you swap the NPI intake and cams for the PI intake and and PI cams you can see healthy increase in horsepower. Pretty close to what the PI motors from 99 up had.

or swap the heads and get more than a PI

Full PI swap is definitely better if you are keeping it stock. Ported NPI heads perform just as well as ported PI heads though. The increase in power you get from STOCK PI heads is maybe 10 HP and that is due to the compression increase you get.

NPI heads do not flow bad at all. Just PI cams and PI intake swap you will pick up close to 40 HP and your power curve is MUCH better. Where the NPI intake chokes off around 4500 rpm's, the PI intake will pull all the way to 6500 rpm's no problem.

or do like me and do a 5.4 swap........

I know where a set of PT heads are but they need to be cleaned up. If you are interested I can get em to start the work on them. They came off of a 4.6 that got the 5.0 Cammer treatment with Patriot Heads.