5.0 wiring??

I want to put a 5.0 in my mazda but I was wondering what do i do about the computer and wiring? any sites that sell 5.0 wiring kits?

You can also get a points distrib, MSD ignition, and a different intake manafold to run a carb instead of fuel injection.. and not have any wires but for the alternator and spark plugs. Prolly be more to do it that way.. just giving you options.