Hi,
Here's a 5-part article on how to do a custom Turbo setup on a 5.0L.
http://www.sn95.com/projects/turbo/part1.htm
I'm currently working towards a turbo setup as well on my 89 5.0L LX. So far, my first mod is the C&L 73mm MAF which I purchased for $80US off someone who posted in the MustangWorks classifieds. Very happy with deal here.
Im still learning the internals of my engine and things so it won't be a year or two before I have something worth showing.
Bye!
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Gautam N. Lad
http://www.cubicdesign.com
http://www.cubicdesign.com/mustang/