Not Ranked
I think there are different timing pointers depending on whether or not the engine was originally equiped with AC and I seem to recall having seen photos with the pointers mounted both ways. To make matters even more complex, there are two different vibration damper diameters. If you switch from one to the other (early small diameter to later larger diameter) you'll have to or someone else may have already relocated the pointer. The only way to be absolutely certain is to bring the piston to TDC using a piston stop (if you've already installed the heads you can get a spark plug hole type through summit) and then mount the pointer whichever way sets the pointer to zero. If you don't do it now, you'll always question whether or not the timing is "right." Trust me. I speak from experience and ended up doing the spark plug thing a week after I got the car running.
Chris
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