I’m no expert. But I know a smattering of aerodynamics. It seems to me that the wings on that plane are very short and cocked the wrong way...no dihedral. Sounds like a recipe for unstable flight.
Back in the days of primitive electronics, I would expect this to be trouble.
I also believe the F-104 design was modified with a reverse vertical stabilizer, using the forward slanted wings, they called it the X-27 Lancer. they also installed a larger and better engine. (General Electric J79) This was a much better design and stability problems inherent of the F-104 completely disappeared. They hoped this version would be ready for production by 1972. All in all it was a dream to fly from test pilot reviews.
I’m wondering how much this plane would benefit with modern flight control computers.
Still obsolete but it would be an interesting and exciting experiment.
The wings had about 3 degree of anhederal iirc