Numbers on cylinder head

[IIA]

Do the raised numbers on my cylinder head mean anything useful? There are two:

RMC23(?)296B towards the radiator
568750CA on the other end


It's a 1970 IIA

[SafeAirOne]

Info on the second number, at least, is available on TeriAnn's page here: http://www.expeditionlandrover.info/landRoverFAQ/FAQ_head.htm