Captain Marvel, Jr. vs. Joe Fixit.

Freeman is currently sharing the Power of Shazam between Mary and Billy, respectively. Is he strong enough to take out Joe Fixit?

Stalemate.

where exactly is joe fixit on the hulk scale?

Fixit usually starts high end Class 70, but he can easily get to Class 100 in a few minutes. Still, Marvel Jr is on a whole nother level completely, even power sharing he could take Hulk out. Plus he has the flight, speed, and lightning to help him.