will these oldie headers work on my a body?

Those look like truck headers to me. I find it hard to believe they we're on a Charger cause the steering is like an A-body in that the center link goes through the header and those don't have the provision for that. I think he lied to you man sorry to say. I remember putting some headers on a 76 Dodge pickup for a buddy a few yrs. ago and they looked just like those.