Schurkey has some good ideas to follow and check out. If my memory serves correct, on an HEI, the plastic rotor on the underside will actually become the advance limit due to the shape of the weights, not the slot like a point ignition. That's one reason the weight shape and installation direction is important. Not saying that's the way it should be but many years ago I remember modifying the weights to get additional advance. That's one reason it would be nice to have some factory weights to look at. I have many sets of point ignition weights and they are not all the same. Unfortunately, I don't have any HEI stuff anymore. HEI distributer is too big to fit any of my engines. I forgot about the center piece. That's an item to look at first. Hope you get it.
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