I have a 383 stroker crate motor with some add ons, including edelbrock intake and larger throttle body. I added a perfect power piggyback system and was told that I am fuel limited right now and need a variable fuel pressure regulator to fix this problem. Are these pressure regulators automatic or do I have to change the settings as needed? Are there any recommendations as to what kind I should get. This is a new area to me. Thanks.