400's are they any good?

I ran the piss out of my 451 for 2 yrs. & it never missed a lick & was the quickest BB i built, A buddy of mine ran 9.3s with his 451 Dart, He took me for a ride in it & literally scared the "sh*t" out of me on the back streets, He was running over 650 HP & a "stock" block.