You say they 'tweaked' your ignition, I hope they never done that while engine was running to get best power because although it may be making best power it may also be too far advanced. I had first hand knowledge of this when we built a 400 SBC and the dyno operator against the advise of the company owner (so I had no redress although he helped me rebuild it) said lets advance it up a bit, within seconds of running it up it detonated the pistons! Big mistake.
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