I don't know if Truman ever did run in stock in '72.
Quote:
After purchasing his Firebird, Truman raced it in Stock Eliminator. He enjoyed enough success with it that he came to the attention of Pontiac Motor Division, who asked him to be a part of their 1972 factory drag team. Pontiac provided Truman with a new 1972 Firebird and a new 1972 GTO to race in Stock and Super Stock Eliminator, respectively.
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https://www.dragracecentral.com/drcstory.asp?ID=14902
Stan