1967 273 Commando Cylinder Head

I am in need of a 1967 273 Commando Cylinder head. The machine shop that was supposed to be rebuilding my heads ground into the water jacket when they were putting hardened valve seats into one of the heads... They haven't ground other so I've only got one bad head and I need a replacement to finish the build. The casting number on the head is 2658920. The car has mechanical lifters and from what I have read (feel free to correct me) but I believe I need mechanical lifter heads.