273 Exh Port MisMatch

Can I Weld-Up this Lower Corner where the Manifold hangs over the surface?
Will a Mig or Flux-Core even Stick to the Cast Iron?

View attachment 1715811268
Now I see it. The mismatch looked different in the other photos. My guess is that you are using the wrong gaskets. Not 273/318 gaskets but 340/360 instead. Just guessing.