start w .040" & if it isn't missing at the end of the quarter (or city block ) you're good & try .005" more. keep it simple, if it starts/runs better w more gap then you're good. I would extend the rotor blade tip w solder as a large gap there is wasted spark energy that is better put to use in the cyl and I would check/adj (if needed) phasing. Get each subsystem near spot on

live every 24 hour block of time like it's your last day on earth