The 413 the beach boys were refering to was the max wedge not an average 413

The average 413 is nothing special, I always think it is funny when you see a Cl add for a "rare 413" from a motor home for $4000.

The 440 is more popular because it will make more TQ in an otherwise equally built motor, no rocket science there Sure the 413 had awesome TQ numbers from the factory but build a 440 with the exact same heads intake cam carb... and it will for a fact make more TQ and equal or greater HP.