1972 California 318 EGR

Thanks. Can they be taken out then tapped themselves to take a plug, then threaded back into their holes?
I don't think so. From memory those jets are removed with a square-drive extension , so the jets are square drive. If you take them out, and flip them over, I suppose you could braze a little flat plate on there, and then re-install them. I think I have seen that done one time; but I think they are SSsteel..