1968 '340' Barracuda vs 1968 '383' Road Runner

1968 '340' Barracuda vs 1968 '383' Road Runner

here are some back in the day times by MT and HR magazine, why was the 383 able to run faster than the 340 if it was like you say at least 30hp overrated, and i would bet the 383 cars had a bit more wheel spin than the SB.
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1968 Plymouth Barracuda 340-S (CL)

340ci/275hp, 3spd auto, 3.23, 0-60 - 7.0, 1/4 mile - 14.97 @ 95.4mph

1968 Plymouth Barracuda 340-S (MT)

340ci/275hp, 4spd, 3.23, 0-60 - 8.1, 1/4 mile - 15.2 @ 92mph

1968 Plymouth Road Runner (MT)

383ci/335hp, 4spd, 3.23, 0-60 - 6.8, 1/4 mile - 15.0 @ 93mph

1968 Plymouth Road Runner (HR)

383ci/335hp, 4spd, 3.55, 0-60 - 6.2, 1/4 mile - 14.74 @ 98mph

1968 Plymouht Road Runner (CD)

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[FONT=Arial,Helvetica,sans-serif]426ci/425hp, 3spd auto, 3.55, 0-60 - n/a, 1/4 mile - 13.54 @ 105.10mph

NHRA from back in the day i have no clue what they were doing or rating stuff at, all i know is now its less popular than men gymnastics LOL[/FONT]

("Chrysler could not rate the 1968 383 Horsepower properly.

"The 1968 383 was closer to 310 HP, no matter what anybody says. The Road Runner and Super Bee
should have been running in G/S or G/SA in 1968 (11.00 - 11.49 Wt/Hp)")

Why couldn't they rate the hp correctly??? the guys that gave us the hemi, and the ramchargers, is this your opinion or is this a statement made by a nhra or Chrysler official?