camshaft break-in

Does anybody out there have any experience to share regarding breaking-in new Comp Cams - or other brands? I've rebuilt a lot of engines, but almost all in European cars. Many of the European engines have had double valve springs. I've built a few American V-8s, but this is the first I've built with double valve springs. The car has been more that three years in progress, and I'm just about ready to fire it up, so-to-speak.
Comp Cams says I need to assemble the valve train with only the outer springs installed until I run-in the new parts per their instructions, and then install the inner springs. Seriously?
I have lots of time, love, and money in it, and if I really need to take this extra step, I'll do it, but this is something I've never heard of before. I've never had a camshaft fail out of (literally) hundreds of engine builds, but like I said, American V-8s are kind of foreign to me. Ha Ha!
For the record, this is a solid-lifter .468 lift, 318 LA motor. If anyone out there has used this kit from Comp Cams, I'd love to hear about it. Did you follow their instructions, or did you just build it and run it (like I'm tempted to do with this motor, and like I have with LOTS of European engines)? And what kind of results did you have?
Hope to hear from anyone on this.
Thanks.
Darts are cool!