The best replacement for 406 is 383.

The best alternatives to 406 are rated as following:
★★★★★  383
★★★  421
★★★  377
★★  383 sbc
★★  383 stroker
★★  377 sbc
★★  434
★★  451
★  355
★  415
★  405
★  468
  eheim 2217
  fx5
  121.5
  306
  eheim 2075
  383 chevy
  aquaclear 110
  sbc 383
  chevy 409

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406
383
421