[oldskool]

I can't say what a stock '68 GTO would run, new.

But, I do have some numbers for a '69 RA3 366hp GTO.

Bought it new, with a close-ratio 4-speed & 3.90 gears. Since I ordered it early in '69, I ASSUME it had the "744" cam, tho I never checked it. Later in the model year, Pontiac dropped the 744, in favor of the 068. The 744 grind specs were used in the SD455 engines.

Ran it on the street for a little over 60k miles. Put it on the track in '73. Only non-stock parts were a Weber alum flywheel & clutch. No slicks allowed. Had hard compound street legal tires. Best time was 13.95, with considerable wheel-spin.

In '74, special soft-compound tires were legal. They were basically just slicks, with a couple of very small grooves. Put in a Hays steel flywheel & clutch. It would then hook up & run 13.50's. Heads had never been off. Still had the original cam & Q-jet.

Guessing that 4.33 gears would have put it in the real low 13's. But, those would not have been as street friendly.