Yep, use finesse not force. WD-40 works wonders.if you look there is a slot in the horn ring for a flat blade-- try spraying some wd-40--be careful prying -- stuff tends to break after all these years ,Lawrence
Yup, same setup on a '66 Dart if it has a factory wheel. I don't remember any horn rings that just pry off. A photo would help I.D. the type of wheel you have.I know my 64 and a buddies 67 has 3 screws. You pop the center cap off with a screwdriver but the ring is screw on to the horn button/wheel.