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13 is a little low, but it isn't absolutely terrible.
Mine runs in that ballpark, however I am running 270's not 260's.
Do you have adj. Cam gears? If so, you can try to adjust cam timing.
It could also be in the tune.... an overly rich engine tends to have a lower vacuum.
your best bet is if you perform a leakdown (make a tester out of 2 gauges, some brass fittings, with a .040" restrictor in between the gauges). Set an air compressor's regulator to 100 psi and then screw that bad boy into the spark plug hole of a cylinder that is at TDC.
Read the pressure drop from gauge 1 to gauge 2 and there ya go... leakdown. A nice bonus is you get to hear where the air is leaking to help you diag.
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