I don't disagree with him. He briefly touched on it. All these cam makers are pushing fast rate hft's as the best thing since sliced bread. Guys in the 60's were experimenting with ramp intensity. They've already been through how far they could go. Guys like Harvey Crane, Racer Brown, Cam Motion, Can Dynamics, etc. The list is long. Now we are bombarded with computer designed cams that a computer says should live, for what, a few ponies and ft. lbs. more. You can find a few ft lb, a few hp, or a few tenths in a quarter mile elsewhere.
He pretty much nailed on the 300 lb. springs. Off the top of my head without looking at part numbers would be a low lift number and maybe 110-115 lb seat pressure z28 type springs. .500 might need 340lb. over the nose(??). Cranes catalog is about the only one I know that shows what a given spring's open pressure is at different given heights making it easy to figure out where you're at. It's actually graphed and a great reference. He alluded to how difficult it can be to get the right pressure springs, how critical it is, and I 100% agree. I say it over and over on this site like a broken record.
Elgin was at one time an oem supplier and I have used their old school grinds, lifters, and springs on quite a few stockish type builds, for higher end I go with Crane. I pretty much stay away from fast rate hft's. No XE's for me.