Alistair, The "boss" on the back of the engine in your large picture has two holes in it that are there for the gallery drillings, and are otherwise common.
The second pic. (59 block) shows the other "boss' undrilled. That is the one the small diameter long fitting goes in.
The next thing after we have confirmation of this, is the details of the drilling (hole dia.)
Andrew; thanks for the dimensions.
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Bluebell
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So many questions....
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