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I found the answer, though a combination of the Skymaster repair manual and a set of Piper instructions on how to weigh a single engine plane without published stations for the gear.
65.00 is the station of the firewall, from the Skymaster repair manual.
87 is the measured distance from the firewall to the ground contact point of the main gear.
96 is the measured distance from the ground contact point of the main gear to the nose gear, parallel to the longitudinal axis of the plane (aka "wheelbase.")
Neither the 87 nor the 96 have any fractional components, so if the weighing was sloppy it's possible that my c.g. could easily be off by an inch, maybe even more.
BTW, If you have a cg app for the skymaster, put in a c.g. of 137.08 and a GW of 3218. You'll notice you can't carry full or empty tanks with two 170lb occupants in the front seats. You're out of c.g. forward in both conditions - that's what made me think my c.g. was wrong. It doesn't fly like a super-forward c.g. plane.
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