Duster Hood Question

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I like the look of the cowl hood, I don't care if it's a Chevy thing. It just screams speed! The cowl on the hood in this picture doesn't look as high as a 4" to me. But I might just be seeing what I want to see, I don't know for sure.

May I ask how you guys are dealing with the fiberglass hood. Have you removed the hinge springs to not damage it. Other than 4 hood pins I am curious. I am putting a stroked 440 in a 69 Dart with an RMS front suspension. I am concerned a taller manifold will create issues for the EFI air cleaner. Thanks