One thing about head work on the OHC: Read TOHCan's post about the valve tip height and about NOT grinding the valve tips. It's critical to their performance that the factory dimensions be maintained after a rebuild.
Primatech has valves custom made for those heads, with the correct tip height and overall length, so that grinding the tips isn't required after a rebuild. Along with the custom valves, we also install hardened exhaust seats, all new springs and new hardened retainers and keepers. The under-cut, swirl polished valves get a full 3-angle valve job and then we cc every head.
I hate to pick on Banshee, but since I get to do it so rarely ... Um ... Tom ... have you ever tried to run and OHC with the valve cover off? Kinda tough.