Hi Dan and all! The mystery deepens! Jim
What year and make of car are you dealing with ?
For example the same basic body shell might have been offered as a
Chev., Olds., Pont,. and Buick.
Each specific year and make might have shared the same basic body but
the finish trim and motor options might not have included the Corporate Small Block V-8 you have.
Find a combination that never offered the SBC and make it one of those.
With the appropriate fenders etc. and documentation , you have it.
Be sure and study at home because it is liable to be on the test.