Yes you can use the BBK TB, but you need some sort of plate to transition the IAC port, the mustang port is lower then the windstar.
Stay tuned for that as I am doing that right now, if I can get my plate sorted out, I can see about having one made for you.
90 LX, Previous 4 cyl.
408W In the Works
TW FAC's, Jay Allen cam, Super Victor 2001 V6 5 Speed Daily Driver
Windstar Intake, Dual Exhuast, CAI, Headers
Best ET: [email protected] mph (on 18's)