Which distributor post is #1 on recent OEM 5.7?

Sure way to find out is to remove number one cylinder spark plug finger over hole have someone crank till you feel compression stroke then remove cap and see where it's pointing fun repeat to verify position
 
maybe I am missing something but the distributor cap should have the number of the cylinders stamped on top of the cap......

cliff
 
Here you go...

FO.JPG
 

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