These strikers are different, as they should be, than those on my '50 and '51 Chevys. Having said that, I think you should have flat screws (on mine they are clutch head) rather than hex bolts. Perhaps they are hitting on the door when it closes. In addition to condition of the strikers and latches, be sure your door hinge pins are not worn. This will cause the door to droop and clank against the striker. To diagnose that problem, with the door open try picking up the door from the bottom. If it moves up with your effort the hinges are worn.You can get oversize hinge pins from the vendors such as Jim Carter.
