Back in that era, John Clegg used to race a super stock '73 455 Grand Prix that he retro-fitted with an SD 455 engine because the NHRA recognized the SD 455 Grand Prix as a stock set-up for 1973. This must have been based on the information that Pontiac provided at the beginnig of the 1973 model year stating that the Super Duty was going to be available on the GP, therefore Clegg's car was able to run in the super stock class. An SD 455 Grand Prix would have been a very classy muscle car. Too bad they didn't produce any these cars, they would be worth a ton now.
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