Valve Spring Compatibility

[HawkX66]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: L78steve</div><div class="ubbcode-body">The higher rate spring will be a benefit at higher RPM's. If your not running at High RPM's use the lower rate spring. </div></div>
Thanks Steve. I doubt I'll be seeing very high RPMS, but I already have the higher rate springs. I'm sure less than 6k rpms. My 69 isn't set up for that kind of power and wouldn't handle all the torque and hp right now. If it isn't detrimental to my cam I'll just go with them so my buddy that is buying the parts doesn't have to spend another $120 or so on springs. He's already up over a grand on the cam and lifter set alone to make my motor what it was supposed to be when I bought it. Long story from another thread, but he got screwed by a builder and didn't know it until I bought the motor from him.
What do you think about the lift question?