I currently have pac 1201 valve springs and want to know if you guys think they will last with my combo. I want to be able to run 6000 rpm. My cam lifts about 0.510. The springs are at 1.72 installed height to put seat pressure at 152#. Which puts open pressure at around 430#. Will be running Johnson restricted travel hydraulic roller lifters on a comp 210/210. Is this a reliable set up? Do you recommend different springs or seat pressure? Thank you!