Slant 6 engine ignition timing stays retarded.

Dana67Dart said

What is preventing you from rotating the dist?

You should have enough clearance to rotate it 15 deg in either direction

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Because the screw that fastens the distributor down is confined in a metal slot. I've got it as far as it will go. As I said in my original post, I was thinking about lengthening the slot so I can go further. Would you like a picture?
What is CAP?