Is the 383 a better engine, or does the 440 just have more displacement?
383 is a LD and a "small" RB . High winding with the correct components, Cam/Springs ETC!
440 is a RB Torque Monster in Lower RPM and Lots of Juice! They Both are great! The RB engines are heavier and taller.
400 is a LD and shares much with a 383 but open to larger cubic inches in stroker versions.
A-body cars IMO should be SB as they are tad lighter and better balance! JMO!
Well unless you want to drop Late mode Hemi power in!