Advice needed on manifold repair

You've gotten lots of good advice above.
Personally, i wouldn't spend ten minutes/ten cents on that mess.
If i could get a buck for it scrap weight......, id take it.
I've got a 33 Imperial straight eight exhaust manifold that is in similar condition (actually,, much worse). It's worth it to me to get it fixed, they don't grow on trees.
But a new, better, intake for a small mopar, is a five minute phone call and a credit card away.