Thanks for the information guys - Don't think I ever saw a "Spirit" non hatchback in person, or I would have remembered it as a Gremlin with different quarter panels.
Don't think I ever saw one of these either:
The car above is supposed to be an 1981 AMC Eagle Kammback.
So... not a Chevette... Not a Gremlin... But I can see that it kinda resembles an AMC Spirit sedan (hatchback) or an AMC Eagle Kammback (although the back/lower back on the #20 kinda curves in more than it looks like on either the Spirit or Kammback.)