Of course it didn't help that the cars they came in were heavy. My '65 Coronet weighs 3800 lbs (no driver) and the engine has aluminum heads, aluminum water pump housing, mini starter, aluminum intake, etc. So off the showroom floor that car was probably close to 4000 lbs. A 426W with the factory manifolds isn't going to be hot rod in that car. It would be a nice executive cruiser and freeway driver, but it wouldn't scare grandma much on the way to church.