Charging system and other wiring change help needed

Here is the pic and diagram of my electrical box.
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67Dart273, I still havent made a decision on which way to wire up the master cutoff switch. Im thinking of ordering a 2 post cut off but even the diagrams I have seen for them has the starter before the cutoff and the NHRA book states "must stop all electrical functions". Is that even possible?
I know I should pick a way and go but really would like to do this only once.Thanks for everyones help.
Rod