Doesn't hurt to just let the galleries under the studs stay clogged if you are replacing the rocker arms with ones that have the spurt holes.
I had ONE stud that was clogged on my '57 347 V8. I could hear the rocker arm squeaking. I took the rocker off and applied brake cleaner through the hole in the side of the stud. Also used a small drill bit to help clean it out. Of course I only got the short passageway to the center of the stud. Let it sit for an hour or two, applying more brake cleaner a few times. Re-assembled the rocker with a dab of assembly lube around the rocker ball. Started it up and was greeted with oil coming out of the stud. Kept working for years.
This wouldn't solve the problem of a clogged gallery though.
If you have a lot of spare time you could have the head tanked, then pull the studs, clean them with a drill bit and re-install them. A lot of work with questionable results.
Here are a couple of old threads that have lots of good info about stud-oiling Pontiacs.
http://forums.maxperformanceinc.com/...d.php?t=702113
http://forums.maxperformanceinc.com/...d.php?t=441261