Moisture seems to gather there, causing corrosion. Try spraying some Press Blaster or other penetrating oil around distributor base. Let it work for a while, jiggle distributor back and forth, it should eventually loosen up.
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'89 LX 5.0 - 5 speed. Original Owner
'94 E-150 4.9 Hi-Top Conversion Van
'06 Mustang V-6, 5 speed
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