Look at your engine serial number again to see it the last digit is really an "X" and not a 7. The 1955-2 3100 pickup trucks had the last 4 dogits as either F55X or T55X (F = Flint, T = Tonawanda Engine Plant).
Your unit number is 0229771 (starting with 1001 at each plant).
The letter "eye" was used as number "one".
Mike B
