My opinion on this is that you shouldn't buy a crate motor and then open it up and modify it. Go with either the 480 or 525 and be done with it. If you are going to modify a motor, pick up an LS2 put the cam in it and new heads. I personally don't have the skills to build a motor myself and don't have an engine builder that I trust, so I felt better with a create motor.
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