Hot rod shops, dude. Try So-Cal speed shop, or the like. Ask oldskool hotrod guys where they go to have their work done. I'd guess that California has more oldskool louver machines in the state than anywhere else, given the hot rod lifestyle that seems to originate there...
How's the truck project coming along? I haven't heard from you in forever...did you get that package of TRD supercharger oil I sent you?
Ryan
