I think most agree that up to three SD-455 engineering mule A-bodies may have been built, but then dismantled & destroyed with no known survivors. Common sense and some documentation tells us that none were built in production since it was not available as an option, and thus there would have been no parts to supply the assembly line. There would have been many other specific parts required besides the engine.
To say that none of us were around then is incorrect. Jack Hoffman tried to order one in 1973 and the original owner of my car tried in 1974. People like Tom Goad and John Sawruk were at GM at the time and may remember more.
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