My vote would be to just fit it and accept the slight pitting as a minor imperfection.
The pitting indicates a "designed cutout" in the head gasket where water has been in contact with the Alloy head, over the years the antifeeze strength may have been suspect and corrosion has caused pitting BUT even if you had it "repaired" it would still be part of the open aperture of which there are many in a Volvo Redblock gasket.
How do l know?........l've just replaced my 940 Wentworth gasket and had to replace the head as corrosion had crept through to No1 cylinder but in fairness the original head had a repair done in 2009 so l assume that before l had the car the owner/s did not use the correct mix of antifreeze and it had more pits than a Welsh mining town .......but we are currently talking 210,000 miles here.
Fit a graphite head gasket NO sealants, new stretch bolts and the jobs a good un'.........................trust me!!
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