How much HP...again

I watched a lot of 383 Superbees and Roadrunners go down the strip in the 60's. The 323 gear cars were all
15 sec. but with slicks, headers and 4.10's there was one that ran around 13.9. With the 440 heads the 383 compression was in the 8's and they were lazy without gears. You guys gotta' stop believing those magazines.