Slant 6 engine ignition timing stays retarded.

dodgemahal said
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?

There is a second adjustment on the plate under the distributor itself, PIA to get to in the car.