The best replacement for 1jz is 2jz.

The best alternatives to 1jz are rated as following:
★★★★★  2jz
★★★★  rb25
★★★  7mgte
★★  7m
★★  sr20
★★  rb26
★★  1jz vvti
★  1uz
★  sr20det
★  rb25det
  1.5jz
  rb20
  rb26dett
  2jz which is better

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Speaking about 1jz, one probably shouldn't forget about w58.

Other search terms related to 1jz and their ratings are:
★★★★★ w58
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1jz
2jz
rb25