No, Just ground thru where the pushrod used to be. I grind the wall back so the pushrod bump is gone in the port. Then duct tape the inside of the port, stand it up, and fill the back side in with JB Weld. Since it's thicker on the outside of the head than the slot in the port the epoxy is in a wedge shape that vacuum is pulling against. You have gasoline on one side and hot oil on the other side. I've never any sealing issues with it.
My point to all of this was JB Weld does a really fine job without issue, so if there are even better products to be had you'll have great success using an epoxy.
That said, If I can get to it with a MIG or a TIG for that hole in the OP's port welding would be my first choice, but if the OP doesn't have that option available just epoxy it.
Tom