The best replacement for 351w is 302.

The best alternatives to 351w are rated as following:
★★★★★  302
★★★★  351c
★★★★  460
★★★★  351m
★★  350 chevy
★★  390
★★  347 stroker
★  347
  4.6
  289
  390 fe
  400m

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Speaking about 351w, one probably shouldn't forget about gt40 heads.

Other search terms related to 351w and their ratings are:
★★★★★ gt40 heads
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351w
302
351c