I am currently building a 440 with eddy heads and would like to use a solid flat tappet cam " not sure yet of manufacturer" but somewhere in the .620 to .630 lift range. While searching for a cam I see that a lot of companys are recomending that during break in to remove the inner spring is this something that is has to be done or is this overkill. My springs are 145lbs @ seat and 380lbs @ 600 lift.