If you don't have any luck with those suggestions which I am afraid will happen, remove the head and check the sleeve protrusion at the block, they should be even all around the sleeve and .002--.004 above the block. The sleeve should be clamped down hard when making this measurement.
Back in the day we had many that the sleeves would settle and the gasket lose it's ability to seal. The 530 had "narrow flange sleeves" and later 188s were built with "wide flange sleeves" with more counterbore support. It was common practice to plane the block surface a few thou. and enlarge the counterbores and remachine the counterbore to set the newer sleeve to the right height. The later wide counterbore sleeves were then installed.
This must be done by a competent machine shop and only the bare minimum material removed as piston to head and valve clearance can be an issue if care is not taken to check clearances.
Only the bare minimum can be taken off the block surface, enough to get a clean counterbore where the sleeve sets.
Also on the first 188s we experienced sleeve breakage about 1/4-5/16 down, a radial crack in the area where there is no stud. Sometimes the only way to find them was to dry everything up and look for a seep line on the interior of the sleeve.
Great engines however after the changes to the blocks and sleeves were made problems dropped dramatically and they will be remembered as one of the best engines ever made.
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