I will start looking around for the .100 valves. Seems the z28 springs on the small blocks were only 15 pounds more then regular truck springs. (95#) Installed on the small block. Been awhile since I used them. But as I recall they worked well on mild cams. I know Im working on a 6. smile I can take a look at what comp wants for springs as well. Is this cam even worth installing from a power point. My motor is pretty choked off with the factory intake.