I'll take a stab - initially it should be possible, they both used the Essex 3.8 V6. The Cougar used a different trans though, and I'm not sure if the wiring harness would work as the cougar had a lot of additional stuff your Mustang doesn't (electronically adjustable suspension, etc). So at first blush it looks maybe do-able with some potential obstacles.
The more important question, I think, is why that particular engine. It was supercharged in the Cougar, and the only real difference between engines that I am aware of is lower compression ratio in the supercharged version. Is that why you want to turbo it - because it already has lower compression?
Edit: just saw your post update - the Cougar engine should already be supercharged. Having said that, if you are interested in supercharging, there are several folks here that have supercharged a V6, Orange 94 being one of them - he will probably have better advice for you if that's the route you want to take.
Thanks a lot I seen some of his build and I am trying to wrap my head around that split port scenario I face I cant find The windstar pieces I need on ebay and I live In vegas Many people here dont trust our junk yards
I want the supercharged engine... I'm currently looking into whether I should even try it before I buy it.... And if it's worth it... I just bought my Mustang and I'm having some issues... With gunk in the radiator... So that's another reason why I want to eventually swap the engine... I also seen somebody take a Lincoln Mark 7 8.8 rear axle and install it in various mustangs... Can anyone confirm this to be possible??? And with that 8.8 will it benefit my stock v6 engine at this moment???