On my TR6 I timed it dynamically as a starter at the same degree as static. At idle speeds the advance won't have kicked in so its a good place to start. There will be a 'sweet spot' depending on engine state and fuels used etc..
On old engines it's kinder to err on the retarded side rather than advanced but only a tad.
I too have a number of 'missing' items that have been sent to various parts of my garage by the wire wheel/grinder, some day I'll have enough to make something useful.
