[mikeb]

Actually, they are the same. I fought this myself; the markings aren't exactly clear.

If you look at the timing set on the right the alignment "dot" is to the left of the actual keyway. The dot you use is the one that is closest to the tooth.

On the set on the left (going by memory here) the keyway shape corresponds to "A" for advanced, squared for retarded, or rounded for straight up. The rounded keyway on that set is about at 2 oclock in your pic, and the dot is at about 12 oclock.

So, if you "rotated" the crank gear on the right to where the "dot" next to the tooth is at 12 oclock the corresponding keyway would also be at 2 oclock, the same as the crank gear on the left.

On the edelbrock set use the rounded keyway and the round dot, with the cam gear dot at 6 oclock and the crank gear at 12 (with the round circle marking) and I think you'll be good.