I recently purchased a 1977 280Z EFI in auto, I have purchased a stage 3 cam from motor sports auto, in addition to a K&N air filter, headers, big throat throttle body, rising rate fuel pressure regulator, Bosch plugs along with wires and a timing kit. My first question is what improvements am I looking to receive with these tweaks, just averages from those of you who have done this and, is there anything else I can do to improve hp without going turbo or adding a supercharger? The ultimate goal is hp, handling and engine longevity. I also have rear disk brakes, anti sway and strut bars already installed. I am new to this so any help would be greatly appreciated. Thank you very much in advance.