I have a 110 984 series & 110 987 engine. The 984 uses a gasket between cylinder head & cam housing. The 987 has never been apart & didn't come from the factory with a gasket between cam housing & cylinder head. Can anyone support this finding? If I put a gasket in there, it would throw valve settings off, but would I get better sealing? The 987 engine is the later design, so you assume other Mercedes design improvement

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83 280TE- 5 spd, 16.5mm rear sway
85 280SL- 15" Bundts, 5 spd