Mike, why do you think it is a 454? Knowing that that size motor had only just come out that year in production cars.
I don't know that it's not a 454; but the odds are more that it's a 396 or 427.
I still say the GTO will take it from mid range until the tach redlines. Depending on the gears in the 55; the 55 may actually fall off well before the GTO. The GTO would potentially make it to 125MPH on it's last breath but pull hard all the way.
In my experience I would only say the 55 would destroy the GTO off the line and the GTO might be hard pressed to catch it; but from a roll I say the GTO would be the victor.
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