The best replacement for 906 is 062 vortec heads.

The best alternatives to 906 are rated as following:
★★★★★  062 vortec heads
★★★★  062 heads
★★  e609
★★  062
★★  062 vortec
★★  md421
★★  921
★  609
★  194
★  876
★  903
  606
  903+
  890
  909

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906
062 vortec heads
062 heads