By the looking of the pics you really will have an easy time with it. Very rare to see such condition aye.
I love the idea of the socket insert as well.
They came with either a lodge CN or a Champion L10.
Use a NGK B6Hs or Champion L90C. Both of these are standard non resistor plugs. The CN and L10 were warmer plugs but not the hottest.
Engine number.............Twins I know sort of but not singles. My single has 59/5083 or the 8 could be a 2.
Another two numbers from past pics. They are around somewhere.
They are really all very close are they not?
I do have some paperwork from ages ago. Hang in there.
I will be getting this right hopefully
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