I can't help you on the valves, but do you have the pedestals cut for stud mounted rocker arms? Are they 3/8" or 7/16" studs?
If you are considering doing that (modifying the posts for studs), here is the info on cutting the pedestals down...
Then again - there are methods that don't require machining the slotted pedestal..
https://pantera.infopop.cc/topic/rocker-arm-stud
Rocky