You are correct in that you need a ccw head unit because it fits on the passenger side with the pulley toward the rear of the car. From your comments it sounds like you intend to run a non-intercooled configuration.
I'm sure the bracket will not fit. Brackets are very specific. A bracket off a 1999 Mustang GT will not fit on a 2000-2004 Mustang GT. I would also guess that you'd also need the supercharger idler pulley. I would question whether a pipe from a 350Z would be the correct length. That is something you would have to find out. Then there are all the other things that you will need to support the supercharger: fuel injectors, plugs, tuner or chip, fuel pump, etc. If you are planning on using the stock MAF at 400 rwhp you will need a Diablosport MAFia.
In a non-intercooled configuration you have to run a draw-through MAF. That puts the MAF in your cold air intake. Your by-pass valve will be in the pipe running from the head unit to the throttle body. It has to have a hose connecting it to the CAI because you can't vent metered air to atmosphere. That pipe will also need a port for the Idle Air Controller.
I am certain I'm missing something. It not impossible to piece together a supercharger kit. A lot of people have done it. It just takes time to do the research. Non-intercooled systems will not make the same horsepower with the same level of boost as intercooled systems because the higher inlet air temperature will not allow for more timing. You might want to add a meth kit to your list of parts.
ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370.
Ret. USAF 1969-1973,1980-1996: Vietnam veteran. Aircraft maintenance. R & D, ICBM Operations.
Also own: 1997 Harley FXDWG, 1998 F-150, and 2002 Corvette LS1