7U D4 head gasket seeping oil

Is it a worry if the head gasket of a '52 D4 7U is seeping oil? I don't see any oil or bubbles in the coolant, or sign of coolant in the engine oil. It runs great and I need to keep it running about 80 hrs/year. How hard is it to change the head gasket? I'm wondering if I should do it while the head gaskets are still (hopefully) available.
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I've had the valve cover off a few times, but never taken off the injector tubing or rocker arm assembly.

Thanks,

Joe

Not a big deal to have a little oil seepage, usual at the front of the head. Got one of those that I live with myself. You could try retorquing the head. Next time you have the head off use gasket sealer and that takes care of it.