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I am placing this here in hopes of helping someone else in a similar situation. My 351C's distrib was stuck. PO beat it up pretty good and did not appear to have any success. The timing was way off. I loosened it by soaking in Aerokroil and tapping from right to left on the vacuum advance mount. Loose is a relative term as it still wouldn't pull. I tried many different methods. I rented a slide hammer but the jaws wouldn't reach around the dizzy body. I took the jaws off and simply used the knurled nut that is used to compress the jaws. Hooking it under one side, tapping lightly, then switching to the other freed the distrib rather quickly. It left no marks on the aluminum body. Anyone else have a method? This one had me flummoxed for nearly a week!
Clean around the base of the distributor, wire brush, scrape, degrease. I'll run around the base with a pick tool to loosen any corrosion. Soak with penetrating fluid, tap lightly with screwdriver/ extension/ etc for a minute or two, this causes vibration that helps work the penetrating fluid into the parts . Wait a couple hours, scrape around base with pick tool some more, soak with penetrating fluid, really pool it on, let sit over night. If the distributor turns, work it back and forth while spaying with fluid to work it in.
A trick I've heard but never tried was to get the engine up to temperature, shut it down, pull the dist. cap/ rotor and pack the distributor in ice bags. Supposedly the distributor, being aluminum, will shrink enough to loosen up in the bore while the block stays hot.
Running an engine flush product could help, usually they won't pull out because of built up/ cooked on oil residue/ crud around the inside lip of the bore.
While applying pulling tension up on the dizzy housing, .... rock the crank forward and back using a socket and breaker bar... pull with your arms, not your back lest ya bang your head upside the hood.