Head venting on Farmall M

OK guys I am putting a 362174-R1 (400/450) head on a Farmall M. I have the 450 valve cover so I can run a rubber tube from then fitting in it to the air cleaner. My question is regarding the vent tube under the valve cover. The 8060 head that came off the M had it and I knew it wouldn"t be reused with the 362174-R1 head. However, there is one of the angled holes in the front of the head for something...what do I put there???

Thanks for the help! Hoping to get the motor back together this weekend.
 

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