I didn't think about rotating the engine while the rocker cover was off, but I'll try that when I get home.
Here are some pictures of what I was talking about. The rocker on the right appears centered, but the rocker on the left appears off center. If you look closely, it almost looks like the alignment is off (if that's what you can call it). The thing that goes on either side of the pushrod on the right is centered between the two nubs of the housing, while the one on the left appears to be down some and overlaps the nub.
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