The best replacement for 7.3 powerstroke is cummins.

The best alternatives to 7.3 powerstroke are rated as following:
★★★★★  cummins
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★★★★  6.0 powerstroke
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★★★★  6.6 duramax
★★★  idi
★★  6.0
★★  6.7 powerstroke
★★  6.4 powerstroke
★★  6.4
★  6.7 cummins
★  12v cummins
★  lb7 duramax
★  12 valve cummins
★  t444e
★  7.3 idi
★  6.5 diesel
  24v cummins
  lbz duramax
  6.7

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Speaking about 7.3 powerstroke, one probably shouldn't forget about most miles.

Other search terms related to 7.3 powerstroke and their ratings are:
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7.3 powerstroke
cummins
5.9 cummins