I seen in a book somewhere there were 553 or something like that, ram air formula's in 1973, they were the left over parts that they put on the first few out the door to get rid of the parts, now that is what I have read in a book, I have one of them BUT I have not done a PHS on the car yet, I think I will now to be sure, BUt it is a 400 4sp car with the raim air. see pic
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