This is not too big a cam for stock rockers. As a matter of fact they might extend the usable rpm range because their moment of inertia is smaller than a rocker with an adjuster or with a beefier body. Dulcich mentioned this in an article, where his LA motor lost rpm when they substituted Comp Pro something rockers for the stockers with no other changes.

IMHO the main reason Comp or Edelbrock or whoever says to use adjustable rockers is to protect them from stupid customers. If you understand that pushrod length matters and that preload is needed in a hydraulic lifter, but it can vary quite a bit, you are smarter than their target audience.

R.