Just so you know that is a MYTH using the weaker valve springs. As long as you have good oil pressure and don't let it get under 2000 RPM for 20-30 Minutes it will be fine.
One time I had a bad oil leak on the dyno after 5 minutes of breaking in the cam, we shut it down, fixed the leak and carried on with the Break in of the cam about 40 minutes later with no problems at all using the springs I was going to use. Solid Flat Tappet Cam.
