QUOTE
I guess I should check with Webcam and see what they recommend. I'm putting in 464/465. I guess they are also called GE40
You should go with what monty wants you to go with...or who ever is building the engine... you want some 9k rpm springs , I have some from Eric Shea"s engine, wear your cam out springs, Your not a racer...
web cam web springs .. 7500 reliably, past that you will need more mods elsewhere...