Myself I bring the engine up to full temperature and bring timing up until it starts putting a strain on the starter (almost kicking back) then bring the trimming down a couple degrees at a time , you want it to spin freely and start right up and use a timing lite to see where your engine likes it, then get a reading at 2.400 rpm and see what your full in timing is... running your timing high will make your engine run hotter, as well as running your carb to lean ( not enough fuel for the air mix) so watch your temp. as you drive and adjust as needed, then the other end of this would be to rich
setting of the carb (black smoke out the exhaust) or stand behind your exhaust and it burns your eye's :glasses7: old school memike :D