Very true. In the late '70s my bone stock 340/4spd./3.23 GTS was running 14.30s, dipped to 14.27 once- only mod was a recurved distributor, the AVS off of a 440, and F60 Firestones in back (and I hate to admit it, a pair of slapper bars). Later additions of Cyclone headers, LD340, Holley 780 and a set of 3.91s put me at 13.30s. Still with stock cam.
But don't take my word for it. 1967-1969 Dodge Dart GTS View attachment 1716097384