Call them and ask them. They will baffle you with a buck of techno bullcrap. Essentially, when valve springs were limp and because the entire world was dazzled by the small block Chevy, lash ramps were long and slow. A cam that used to lash at say, .014 hot was considered a lobe suitable for 50k miles adjustments, but a "racing" lobe would need more lash and frequent adjustments were considered acceptable.
Today, that same .014 lash ramp would embarrass the best ramps of the 1970's.
More than .020 hot on most of these old lobes is plenty. As long as the valve isn't being held open at temp you're fine. There is no sense in beating the valve train apart because that is how they used to do it.
Edit: I'd also say that if you are moving 2 degrees either way from a split pattern ICL the cam is wrong and more power and better performance would happen with the correct timing events that by crutching a bad cam by moving it ahead.
