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As mentioned I would check top dead center and make sure the pointer is right. A lot of time when you have a lot of heat in the exhaust the timing is low. You say it will not idle below 37 to 38 degrees and this may another indication that the pointer is wrong. You did not say at what rpm you are checking the timing but if that is at idle the pointer has to be of or cam timing.
Good luck, Keith
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Keith C
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