my 70 was doing the same thing . they have the same ign. try this pul the steering wheel off and at the top of the colum look as you turm the key back and forth there is the steering wheel lock take that philups screw out and the little medal plate out and try a few drops of lite oil in there see if that helps. there is a shaft in there that when u turn the key that works the ign part way down the colum.