I have a 351C with a comp cams 280H magnum cam. Since I've installed the cam I've sheared off the roll pin, which holds the gear on the distributor shaft, several times. Now I've started eating the distributor gear. About a month ago I destroyed a gear, stripped all but 7 teeth off. I replaced the gear, put about 25 or so miles on it. I pulled the distributor today to check if there was any wear and found the teeth half ground off? I figured the cam was walking around, so I pulled the front of the motor off and check the cam retainer plate. It seems to be doing it's job, the side of the plate facing the cam has little to no wear on it as though the cam isn't even riding against it. I can't figure out what's going on here, any help would be appreciated. Thanks