building a mild Daily driver 318

My 70 Swinger340-4spd-3.55s pure stock on the E-70s it was born with,ran [email protected] with mega tirespin;(Those belted Goodyears were good for nothing, except laying 3gear blackies) so I get that. And I'm aware of the under-rated 340.
But there was a guy in hi-school with a 71 Demon340A/T, totally stock,who ran 115.

115 mph? Mr. Norms supercharged or what, cause no way a TOTALLY STOCK 71 Demon going 115 mph in the 1320.... lol. Sounds like a fish story and you ate it hook line and sinker