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More than enough. I ran a 454 ~550-575HP with a 3/8 line, AFR did not lean-out during all my 1/4 runs (I have an AFR meter in the car).
 

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Is a steel 3/8 fuel line big enought for a 450HP 396 with a mechanical fuel pump?
in most cases yes!, of course fuel line fittings, used, filters installed and cheap fuel pressure regulators, with restrictive ports could potentially restrict flow
 
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