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The spark lever should be treated as if it was a vacuum or centrifugal advance and should be used as such depending on speed and load.
Blown out gaskets could be because the "new" head and block deck were not checked for flatness and just slapped together. Could be wrong head gasket. Could be spark timing as suggested. Could be not re checking the torque.
There are still a LOT of cars out there with the stock head.