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Thanks Capt Kirk. That was my thinking but wanted some advice. I don't know the condition of the engine except that a compression test shows perfect compression on both sides so I think the top end is in good nick. Don't know how to test the mains. Yes Terry the distributor has been rebuilt and set up on a machine. I't didn't used to do this but the surging started before I rebuilt the carb so I think its likely something other than the carb or distributor.