The best replacement for 4.6 is 5.0.

The best alternatives to 4.6 are rated as following:
★★★★★  5.0
★★★★★  5.4
★★★  5.7
★★★  5.4 f150
★★★  ls1
★★  302
★★  5.7 tundra
★★  5.0 mustang
★  5.0 f150
★  5.4 which is better
★  5.4 triton
★  5.4 ford
★  5.4 expedition
★  351w
★  lt1
★  5.4 engine
★  4.8
  3.7
  5.0 stroker
  5.8
  5.0 cobra
  4.7
  5.9
  mustang 4.6
  4.0 range rover
  dodge 4.7
  5.7 toyota tundra
  5.0 mustang gt
  savage x
  3.9 bootloader
  revo
  5.4 gas mileage
  t-maxx 3.3
  3.9
  4.0
  revo 3.3

Your alternative for 4.6 is not listed? Suggest!
Speaking about 4.6, one probably shouldn't forget about 5.4.

Other search terms related to 4.6 and their ratings are:
★★★★★ 5.4
★ ios 7
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4.6
5.0
5.4