The best replacement for gt40 heads is e7.

The best alternatives to gt40 heads are rated as following:
★★★★★  e7
★★★★  gt40p heads
★★★★  e7te
★★★  351w heads
★★  trick flow
★★  edelbrock
★  gt40p
★  afr
  windsor jr
  e7 heads

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Speaking about gt40 heads, one probably shouldn't forget about e303 cam.

Other search terms related to gt40 heads and their ratings are:
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★★★ stock intake
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★ f cam
351w
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