No one wants to talk cars here even if they are Stovebolt powered but I actually have the same car. Has a 261 in it now, but ive run the 216 for years b4 changing it. The exact thing happened to me a few times. Pull the drain plug, then poke to get the oil out. Its not uncommon. Do the diesel trick, Justhorsearound mentioned. That engine was probably run on nondetergent oil it whole life. Nondetergent oil is designed to leave the crap in the pan. More modern oil is designed to suspend the particles so they flow and get trapped in the filter. I wouldnt be afraid of it. Change oil often, make sure its full always. Run it. Keep us updated.
