I'm not a proponent of the "every engine needs a custom cam" idea myself but acknowledge that the best cam for any engine is one that is ground for it. I take the path of return on investment, i.e. value. If a shelf grind can deliver the performance needed and is less expensive it's more value to my customer. That being said there are times when something special will deliver something more, and in those instances I'll order custom. In terms of the theory being discussed when I order custom cams I tell the grinder where the ICL needs to be based on my own research. It's much more important to me than LSA for the reasons noted above. Just looking at LSA does not tell you where the most important event is (at least in most of my builds) - that being the intake closing event in relation to the piston's motion. The lobe centerlines are also more important with modern assymetrical lobe designs where the "centerline" is the center of max lift, not necessarily the physical center of the lobe.