I wouldn't be prepared to take the chance on leaning out at 5000rpm myself, They are borderline in my opinion.
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My monza was a v8 monza from the factory, and yes they did come with electric in tank pumps. i would love to put a mechanical one on my car and i might take on that project over the summer.
just an update....I got a standard carter fuel pump from my local bumper to bumper store and I love it, Its quite, its small, and it fixed my cutting out problem.