The best replacement for 351c is 351m.

The best alternatives to 351c are rated as following:
★★★★★  351m
★★★★  351w
★★★  302
★★★  351w difference
★★  400m
★★  429
★★  351pd
★  351w ford
  43c
  ford 351w
  351 w

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Speaking about 351c, one probably shouldn't forget about aod.

Other search terms related to 351c and their ratings are:
★★★★★ aod
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351c
351m
351w