71 model 318 with points ignition. Attempting to install new points, and I cannot get the points to open at all when the rubbing block of the points is on the lobe of the distributor cam. Moving the points assembly as far as possible within the slot for the mounting screw does no good. Lobes of the dist cam do not seem worn down, and the distributor seems to work fine.

Has anyone ever dealt with this problem?

Thanks!