Et967 ideal set up

Location
England
Hi everyone looking for some advise been out the game 12 years when superjets were the thing so all this is abit new to me, Rebuilding a et967 in rickter xfs hull, was on a b pipe with stock ingition, will now have a power factor pipe, its on pump gas domes, will be running 99 super unleaded but i do run my bikes on avgas so its an option, 48mm spectrum carbs, ive got a total loss igntion what sort of timing advance would be a good starting point please?
 
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