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

So,if GTX John can run 10 seconds with a 318 in a 3400 pound station wagon, what are you big cube guys doing wrong? Given an unlimited valve train, intake manifold, and exhaust he is still running stock compression and cast iron heads.
Maybe not so much what the big cube guys are doin wrong, but more like what @GTX JOHN is doin right!