I have the S70025K HS as well and use chevy length plus .100 valves.

Lash caps do work great but keep in mind when setting the whole rocker system HS seems to be pretty clear on how the adjusted is positioned and stress iirc the 2-3 exposed threads on the adjuster for oiling.

I think they have that PN kit due to the fact here again iirc even the std edelbrock head is a .100 over a std. length 2.02 3/8 stem valve.