The 536 will always be green for the simple reason that the million 0603 bottom caps come preassembled, and they can only get preassembled on green boards.
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The card will only run at 7mhz under 1.3 so there is no point. WHDLoad will take care of any special kickstart needs, so if you really want 1.3 for some other reason, this card is not for you (since you'll get pretty much a speed identical to that of a basic 68000 when running at 7mhz without fast ram).