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

To me street strip car is a car where the strip is primary focus driveability takes a backseat basically a racecar with a plate. Street Machine whatever you want call it all out performance is still important but willing to compromise performance for a more street friendly ride and just trickles down from there to warmed over to dead stock. Obviously there's no hard lines about this ****.