Just a fwiw mention on a '65 Wildcat that was locally purchased in an 'estate' type situation. Much engine and other work had apparently been done, but no documentation as to what. The car ran/drove, but the nailhead shook like a wet dog. The usual compression/electrical/fuel checks were done with no help. Then, the front pulley and flexplate were further examined=the flex was found to be installed 2 bolts offset(120 degrees) from correct. After a bit of labor, the result was a much happier 'cat and new owner.
