The base gaskets are not intended to stop leaks they simply are used to correct or adjust for differences in height. Assuming that there is a flat contact surface between the base and the block.
How are you measuring deck height with the cam towers attached?
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78’ SC 911 Targa - 3.2SS, PMO 46, M&K 2/2 1 5/8” HEADERS, 123 DIST, PORTERFIELD R4-S PADS, KR75 CAMS, REBEL RACING BUSHINGS, KONI CLASSICS
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