I wouldn't touch the head studs.... For the same reason that Bryan mentioned, and because I wouldn't f with something that is as critical as head studs on your journey.

But you know what the issue was? You brought all those spare parts and your car said "he doesn't believe in me?! Alright.... Fix this cracker! ;)". Lol.

Seriously, I hope you get it figured out. Not a comforting situation to be in. At least you're not mixing oil/coolant or leaking into any cylinders. So there's that!