Iron head welding

Bewy said

The problem I FORsee is you are welding very thin metal. I assume the surrounding metal is thin because while porting, you broke through the metal. I would make a rectangular metal plate out of mild steel, & shape it to fit the exposed area. You will then be welding thicker metal, less chance of blowing more holes in the CI.

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If the entire surrounding area is also thin = You have your work cut out for you.
Might be worth seeking out a Professional Cylinder Head Porter and getting an opinion?
Since it is a Intake Port that does not get near as hot = Perhaps a tube and a bunch of epoxy? My Superstock Small Block 340 heads sometimes have a bunch
of epoxy. However, I am only asking them to run hard for 9 or 10 Seconds!