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The cam in the crate engine should make power to the upper 5's and maybe 6K.

Something is making a mess of the higher rpm range, like jetting or valve springs.

Just because edelbrock says the springs are good to X lift, doesn't mean they will be good to that lift with a roller cam. It's a horrible way to sell a product and now they have another part number for roller applications. hmmmm. I don't think the ede springs have enough seat or nose pressure to control the valvetrain.