I asked GTRaptor when he did his because I wanted to do mine.
He told me for parts and king cobra clutch he payed 1200 and di thew installation himself
so 1200 for parts
and however long it takes to install it.
where as if you want to keep your mustang because you love it and pay 2400 for a new automatic, you can do this
I think there is a tech article here that shows the swap on his car

I'll look for it
Edit: I found the article I was wrong 1400 fpr parts.
http://www.allfordmustangs.com/Detailed/25.shtml
that's the article so save up a week of work more lol.