Need big block help

There is mention of a “spring kit” in the labor ops for the heads, but I see no mention of what that spring kit might be.

It’s probably worth pulling a couple of springs and checking the installed height/pressures if that info isn’t in the paperwork.

It’s not only the added weight of the lifters you have to deal with. That family of cam lobes are fairly aggressive, so the spring also has to overcome the increased valve opening/closing velocities.

Looking at the Comp catalog, the recommended spring for that cam is a 925-16.
Imo, that spring is not a very good match for that cam with those heads.
For example, It’s way less spring than what would come on a set of Ede RPM’s that are fitted with their HR spring.