Ford 272 C.I. runs low 11's. Why do Mopar guys need 408's?

Ford did have a 221 and a 260 V8, they could easily grow to a 272. But this guy is 6 popp'n it ??? :) I seen a Pontiac that had a 4 cyl (from the factory, half a 389) and it would go 11's

Do you know (or can you find) the class rules he’s running under?