1974 KZ400 severe oil leak

Hello,
So we have a slight oil leak (ok... its not a slight leak) on our 74 KZ400. It isnt the head gasket, nor is it isnt any sort of gasket. Where its leaking from is some sort of port on the cylinder jugs.

There is something we noticed, which is, there appears to be two different 1st gen KZ400's with different ports in the head. (i've included pictures of both heads as attachments) The original head we had on it did not have the extra ports. The 2nd one has the extra ports and now it leaks oil from the fins on Cylinder 2

Also included is a picture i took, with a pick pointing out the aforementioned port