Howdy Fred:
I don't believe there is any stamping to differentiate cylinder heads. We did pursue a machine stamping on a machined pad on the left front corner of some early blocks to ID engine size, but gave up on that one as it was inconsistent and unreliable.
The best I can offer is that the C0DE casting code on the 144 engines is unique to that engine. The 170 and 200 engines have used C1DE to D0DE & Z. The way to distinguish engine size is to count the freeze plugs under the exhaust manifold 3 = 170, 5 = 200. Another addendum is the the C9DE casting with an "M" suffix was also used on the 1st 250 engines. The latest casting code we've come across on what we believed to be an original OEM 170 was a D0DE. If an engine has a D3 or later casting it is likely a 200 or 250, or an updated, not OEM 170.
Any head casting codes of D3 and later will either be on a 200 or 250 engine. Until the '80s it is fairly easy to differentiate between a 200 and a 250 because of the starter location.
The hard part of the answer to your question is due to the fact that FoMoCo shared cylinder heads between engines. In the case of the C9XX and the D0XX, they have been found on 170, 200 or 250 blocks.
THe other hard part is the fact that in all three applications the internal dimensions were identical.
Sorry, No easy answer.
Adios, David
