Merlin heads no i.d.
I recently bought a fairly high end street car w/468 bbc trying to i.d. the heads and i have ran into a brick wall as i have seen many others on here. They are merlin cast iron with the cast id no of 1-043 A? i researched merlins site and they have no listing for the "A" head they are on the engine and really dont want to tear it down to spec. the heads .I am hopefully going to up grade to a set of alum but i dont want to put the same volume ,cc,etc. heads back on. On the ends of the heads is stamped "OVR" someone said they may be marine heads i dont have a clue ?anyone know the runner size, chamber,etc. on these "A" coded castings? Worlds site list the b-c-and d but no "a" whats up?
thanks, machine.