Jim Yanik wrote:
Are you sure it's a carburetor and not just a throttle body with single
port injection?

Totally, absolutely, positively, one hundred thousand, million,
billion, trillion percent. The carbureted 307 was last used in the
1990-model cars. In 1991, GM replaced it with the FI 305.

Is the TPS wired up?

Yes.

Maybe somebody put the wrong carb on.

Not a chance. The car has been in the family since new. It has the
factory carburetor.