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Most of the stock Mopar distributors I have worked on have the amount of advance stamped into the bottom of the advance plate, most of mine say 13, look at yours and go from there




And let's just make clear that number 13 you are throwing out there is "distributor degrees". That number needs to be multiplied x2 for "crankshaft degrees". So in fact the distributor your working on has a total of 26* mechanical advance built in.

As for vacuum advance. The allen wrench adjustment ONLY tailors the "rate" at which the additional advance comes in. It does nothing for the total amount it moves the advance plate in the distributor.