I don't run a ZE, but since people have run the cams in the DE heads they must be the same cap and lobe alignment, just with more agressive lobes.
There is a "timing drive" gear and a "friction" gear in each head. The front "drive" cam is obvious because the end of it mates with your distributor. Two of the cams will have what appears to be a split-gear. These are your friction gears. The camshaft caps and lobes are in different positions in each head so you can't misalign them. Just hold the cam over the head and compare the cap positioning to the runners on the camshafts. After you figure out where each one goes make sure to match up the dots found the inside of the camshaft gears on each set as you place them into the heads.
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