What cam would I need if I decided to build a 260 hp 4.2 liter motor? What heads can and intake?

 

Heads, you can port you 3.8 heads or 4.2 heads whichever you want. Cam is up to you, you can use eithe rhte 3.8 or 4.2 but I would get a custom one. As far as intake, go to the junkyard and get yourself a windstar intake.

This is a good how to on the swap.

http://www.mustangevolution.com/forum/f133/t9601/

 

So 4.2 and 3.8 are compatible with each other

 

What year windstar? I have a 2000

 

2000 mustang

 

94-98. They are split port and almost bolt right up. There's a few things you need to however. Just search windstar swap and you'll find a lot of info on it.. That swap alone gives some pretty decent gains. And yes, the 3.8 and 4.2s are virtually identical with the exception of the crank.