I know it sounds like piling on at this point but:
1.) The SD-455 engine was only available in the Trans Am and the Formula in '73 and '74. If this '74 Grand Am you've found has a SD-455, it was owner installed.
2.) Swivel bucket seats were not an option on the Grand Am in any year. These seats were only available in the Chevelle/Laguna, Monte Carlo, and I believe Cutlass (although I've never personally seen a Cutlass with them).
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Just a blind squirrel looking for a nut.
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