64K10,

The gas is on the bases near the throttle shafts. It is just a light coating that occasionally dribbles down onto the manifold. The gas is there when I pop the hood immediately after a drive and when the engine is still running. It eventually drives up after I shut the engine down. I am running insulating blocks with gaskets on top and below the insulating blocks.

The funny thing is that I can have the engine idling in the driveway and/or vary the RPM's in the driveway for twenty minutes and not have any leaks. Yet if I go for a twenty minute drive the carb bases are wet with gas. I guess that is why I was thinking the seals on the accelerator pump rods that leak when gas is sloshed around in the bowls during a drive. I guess I'll know more whenb I take 'em apart. Thanks for your suggestions.