340 slight dieseling when hot and hard start

crackedback said

My guess, not enough initial timing.

Low initial timing = more throttle blade opening = dieseling issues

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x2. You can't check now, but you should have checked before you left...lol ;)
Loosen the distributor and turn it about 5° clockwise. The reset the idle speed. If it gets better, leave it - best not to upset the apple cart in the middle of a long trip. Then when you get home plan to tune it for real.