If you intend to keep the car, the fix would be to check the cams and rockers for wear and replace if needed, and replace the ball studs.
You might get away with increasing the pre-load on the ball studs with thicker shims.
Do a search on 'hockey puck' or 'ball stud' and you will find a lot of information on this.
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe