Yes, you can use the 3L heads. You just have a lot of options to consider.
You won't use the coil on plug, you'll use the factory Contour ignition system and engine harness.
You may also need some fuel rail or line modifications because the Taurus feeds from the opposite side of the engine on the Taurus. Talk to Puck Puck since he has made it work in his Cougar.
