Well, I'm not certain which Mustang, but I assume an early 90's 5.0.
I drive it pretty much normal...Just cruising around, it likes low RPMs a bit more. I find myself downshifting less than my N/A 93MTX.
It starts to build boost at about 3000RPM. By 5000, it's at about 6PSI. The max I've seen is 10PSI.
It's pretty drop dead simple, actually; a lot easier than fabbing up a turbo (sorry tim).
Everthing needed from the shaft stock, to the coupler, to the bearing, to the blocks of metal, can be purchased on the internet (eBay FTW).
Making it all work is up to you.