It looks as if the frame might have gone up a bit at the head lugs as well. Any chance of better pics?
Before spending anything I would try the old method of pulling the front wheel forward, it could be improved if not quite correct. Just lie on the ground, grab the front wheel, feet on the chainwheel, and pull. You need someone looking down from the top to tell you when to stop. I would say it probably needs about 3 cm forward, from the look of the pics.
This used to be a common emergency repair. I would think the tubing is probably some ductile seamed stuff, the owners of bikes with 531 used to refer to as "gas pipe".