Never the less after running through the load calculations, (MSD used to have a cheat sheet on their web site, I'm sure others do too) I saw the overall load was more than 130 amps so that was when I bought the MSD unit. As previouosly posted it worked perfectly unitl DW 11 when it just died at the same time I tossed the alternator belt. I don't know which happened first but it still spun, so it didn't freeze up.
So after reading about the output levels of the PowerMaster units, they send a card that shows what your particular unit did on their test bench, I bought the 200 Amp unit. I know it sounds excessive but with the exciter wire its rated to output 140 amps at the speed my car idles at with 2.8 pulley ratio. This just covers the fans, pumps, ignition etc. So now driving around I see 14-14.2 consistently on the voltmeter guage and which is backed up by the datalogs. No starting issues after driving at WOT for the road course and the drag slalom or a bunch of start-ups and shut-offs testing the cooling system.
Your needs and results may vary.