I'm not saying the dizzy being off a tooth or 2,3,4,5, whatever caused anything. What I will say (Again) inspect and verify, that the valves can move freely, and check the height across the valve stems as directed by Jerry above. Also inspect and verify the rocker arms move freely on the shaft without binding or any scratchy feeling. Checking the pushrod is seated needs to be on both ends of each! Not just the lifter, it's very easy for the top of the pushrod to be off center. And as Jerry said, check the length of those pushrods, and the ends can be worn and have a crushed or pushed down depression in them. If you see that, consider replacement if they all show damage. (my point oh two!)