The T5 is not the long-term gearbox for you!
Have a look at
www.corral.net Their forums are probable the biggest Mustang forums on the planet. Just do a search through previous threads and you'll quickly find everything you wanted to know. Post a question about finding an install site, and you'll no doubt find a step by step website that shows you everything.
I seem to see : Tremec boxes, Pro 5.0 shifters, Ram or Star clutches and SVO alum driveshafts mentioned regularly.
Good luck!
Craig