Scott, there are other possibilities which you'll find when you pull the distributor. First and most common is the roll pin. I've not heard of a double roll pin breaking so it may well be one of the others. #2 is breaking the pump driveshaft between the pump and distributor gear; hardened drivershafts are less than $15. #3 is actually shearing badly worn gear teeth off the distributor drive from a couple of causes, one of which is metal incompatibilty and the other is a cam with its integral gear cut on the wrong tooth-angle. The last has happened from all known cam grinders since they all buy cam-blanks from one of only about 3 manufacturers. I'll be waiting to find what the root cause actually was. On the good side, if dropping the pan and checking #1 or #2 rod bearing shows only light bearing wear, you dodged a bullet. Good luck-
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