Timing a 240 should only take at most an hour if you literally pull the distributer out, make sure your at TDC and point the rotor at 1. Then after that time it with a gun. If you havent pulled the distributor out, and it ran fine before. Just undo the to 10mm bolts, and turn the distributer till it sits towards the center of range...or if thats where it is move it slightly one way or the other and see if it runs better.
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