Anybody notice this when driving your Mopar?

I somewhat have the same problem i have a 72 dart with all the hot rod looks and a slant 6 so in town i have all the kids in hondas wanting to race and it wont run with them but i also have another 72 dart that looks almost identical with a built 360 so when i catch them in that one they look shocked and dont know how the car they smoked yesterday just stomped them today its great