Pete,
While you're inspecting the center section, lift it up and start flipping it over in your hands.... it's awkward because it'll be heavy...... all of a sudden, "accidentally" drop it on the owners foot and say.... "oops, no thanks you crazy-a$$ crackhead!"
Forum member Tarafied just picked up that junker '67 and would probably part with the open 2.79-3.00 center section for less than $50. A $4 gasket, three quarts of 90wt. and a few hours of elbow grease could save you about $550.