They didn't because at that point the 440s had 25 less HP and weighed more. So it could've been slower and used more gas. You could get a 440 Warlock in '78 that was basically an LRE w/o stacks. They were slower- that's most of why the big blocks went away. Everything to pass smog meant that the large cars with big blocks just couldn't compete- that writing had been on the walls for years.
