Wow, awesome- This project has tremendous potential!
I think the V6 in that car could be a fine starting point for you. Look into what goes into installing the windstar ram air kit. Also look around at pros vs. cons of centrifugal/twin screw superchargers, vs. twin/single turbo and/or nitrous kits. And you are also going to need an ecu tuning computer, probably an xcal3 with a laptop or something similar to monitor the system for when it's all together and ready to run. I think project has tremendous potential and would love to see another beast V6 confuse the hell out of some hot shot punk in dads cobra lol!
Take your time do the research, and with the right amount of hard work your V6 will scream! And please keep us updated along the way. And find out whee you can have your block machined while you strip it down. Maybe look at pistons, cam, and other valvetrain parts/setups
If I could have my way (unlimited budget with my 97) I would bore/stroke to 4.2, get a nice set of split port heads from super six and a windstar kit add a single turbo and some long tube headers with a modest shot of nO2. nothing too psychotic though because I would just rather drive it longer before having a problem that would require a rebuild...nitrous can be risky all I'm sayin.
But this is all just my own opinion, anyway.