The best replacement for 6.7 is 5.9.

The best alternatives to 6.7 are rated as following:
★★★★★  5.9
★★★★  7.3
★★★★  6.4
★★★  5.9 cummins
★★★  6.4 powerstroke
★★★  6.0
★★★  6.6
★★★  6.7
★★★  6.2
★★  5.9 cummins diesel
★★  duramax
★★  ecoboost
★  6.0 powerstroke
★  lml
★  6.2 ford
★  7.3 powerstroke
  3.4
  5.9 diesel
  6.4 ford
  dodge 6.7
  powerstroke 6.7
  zipp 404
  cummins 6.7
  ford 6.4
  5.9 dodge diesel
  duramax 6.6
  chevy 6.6

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6.7
5.9
7.3