I have a lot of SVT parts lying around if that is the route you want to go. I think if it was you I would stick with a straight 3.0. Leaves options down the line. The 3.0 was automatic so it never did mate to a MTX-75. Modifications need to be made that I'm sure you can find on this forum. You could also just have Buckshot build a complete 3.0 for you ready to drop in.
For engine management I would seriously try to get a hold of a 2000 contour or cougar computer and get a hold of a twEECer. You are going to have to go through getting your pats redone anyway. Then contact DemonSVT for a good base program so you can tune the car yourself. Or you can get any year V6 computer and have me burn a chip for it.