David-
I have done some light research on the topic. I'm actually still trying to decide if I want to put any markings back on my car. All I found on mine was the P, B & T markings along with some white crayon markings on the engine. Other than that, the 160,000 miles of Connecticut driving did away with almost everything else on my car.
Anyhow, back to the question. I've never seen any SPOT regarding correct inspection markings for 1st gen cars. (SPOT = single point of truth.) Your best bet is to clean each original part very carefully, then see what you find. The original markings may be very faint. You can also check out the pictures on the Lucas Restorations site for reference. I don't know if what they do is 'correct', but they are supposed to really know their stuff.
-Jeff
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