Avman,
I assume your tires are about 25.6 or 25.8 inches in diameter and you made a typo when you said the rear axle ratio was 3.80 when it is actually a 3.08 ratio. (A 3.80 ratio seems strange for a GTO).
If you are running a 3.08 with “short” tires you are going to lose acceleration time by going to a “taller” tire.
Of course, every little bit of “tuning” helps but I don’ think you will appreciably improve acceleration without a “stiffer” rear ratio. (The drop off between the first and second gear ratio in your tranny hurts a lot with a “cruising” rear ratio.)
Nice looking car!
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