Do yourself a favor and get the work done. The last thing you want to do is
a) Break a stud with a big lift high rev cam
b) Pull a stud
c) break a stock rocker
Please go out and get a nice 7/16 ARP Stud with Guideplates, some Crane roller rockers and get the machine work done.
I'm also slightly dissapointed with the misinformation being given out here. There's not even a slight chance of that being a pedestal mount rocker. The base of the stud is clearly visible and in no way resembles a pedestal mount rocker system.
http://reincarnation-automotive.com/pedestal-mods-page-2-before-after.html
Take a look at a before and after of what a pedestal mount looks like. Note the rectangular notch in the boss for the stud. This is where the ''pedestal'' is derived from.