Not Ranked
The pushrod hole can be completely open with out any problem as the pushrod is located by the lifter and the rocker arm. It is more likely a problem if it is NOT open enough which may result in the pushrods being interfered with by the pushrod hole.
I would be more concerned with how much meat there is between the pushrod hole and the port.
As for the port - I would just smooth it out as best as I could. It doesn't look very pretty but it should work fine.
Pat
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