Bruce Toth sells an import casting that he gasket matches , pocket ports and fills with decent valves , springs , keepers etc.
1800 shipped.
I haven't run them yet , but did pop a couple valves and looked them over.
I think they'll work O.K. for my 408 , which is pretty similar you yours.
http://www.1962to1965mopar.ornocar.com/toth-mopar-heads.html