The hex nut was smaller was the big issue, finally got it out with a deep well extractor socket, they had stripped it till it was almost perfectly round.
It was also gapped wrong and a bit short but I got a new one in yesterday actually, now my car misfires less but I'm thinking the extra stress got to my engine cause it sometimes doesn't feel like it's getting proper power; I'm hoping it's fuel delivery, two of the other (correct plugs) were very light colored near the end when I pulled them out so I think it's running lean sometimes. I have a new filter and pump on the way.
They were all also soaked in oil I hope that's just the valve cover gasket.
There's a pair of two Capris the same year as mine within driving distance for sale for parts, just trying to save up enough and keep my current one running till I can afford them (Crossing my fingers they're still available then).