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This is one of the places where the FE motor is unique. The distributor passes through the intake manifold and if the manifold is not centered on the engine, you will have a leak at the distributor. To repair this type of leak you will have to re-install the manifold, using the distributor as an alignment tool. You can check if the manifold is centered by removing the distributor from the engine. Remove the o-ring from the distributor and re-install the distributor without the o-ring and check if the gap between the manifold and the distributor is even all around the hole. If it is, you can replace the o-ring and that should be the end of the leak. Note that the o-ring is not round but kind of wedge shaped with the wider part of the seal toward the top of the distributor.
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