I followed this procedure a few years back when installing a Howard's cam and everything turned out OK. I believe that I used Comp's break-in additive with some 10W30 (either Brad Penn or Valvoline VR1 oil, I can't remember which). Removing the inner springs probably wouldn't be a bad idea. Just don't rush things and rev too high too quickly.

"When I'm in a slump, I comfort myself by saying if I believe in dinosaurs, then somewhere, they must be believing in me. And if they believe in me, then I can believe in me." - Mookie Wilson