[RanchTruck]

The center of the filler cap on the plastic boat tank should have a little knob. Loosen it and the knob unthreads from the cap, which opens the vent for the tank. That should fix your pulling a vaccum in the tank issue. I've got a lot of vehicles running on boat tanks.

Ogre, you really shouldn't keep giving ignition advise if you're not familiar with the straight six's. The whole distributor body is rotated by the vacuum advance, so the cap and wires twist with it as the vacuum advance moves it around. That's normal in this case. It's not like a distributor body held down with a clamp bolt and only the breaker plate being moved by the vacuum advance, the whole distributor is being moved to accomplish the same thing.