[HawgRyder]

If you do choose to weld them...remember...remove the guides and weld the entire hole shut.
After the welding...you can bore the guide hole to size...and be reasonably sure that you have good contact with the head to guide fit (for heat transfer).
But....I would go with Steve and Andrew...find a good head to replace it...probably will be cheaper in the long run.
And in the future....the guides should be cleaned off on the port side before pushing them out.
I use a tube-like tool to make the outside of the guides smaller before pushing.
Bob