A mechanic friend is coming on Tuesday to help removing the old header (hopefully without breaking more stuff !). At least nothing important broke.Yeah, those bolts and nuts will be a bear to get removed after being on the car for 30+ years. Lots of penetrating fluid and a little heat from a torch should make them a bit easier to remove.
I've also ordered a bunch of gaskets, a set of new studs, a new oxygen sensor (pretty sure the current one is original seeing how black of carbon it was !) and a brand new catalyzer from Rockauto.
Next week is going to be packed 😄