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Too much overlap leads to reversion, lazy throttle response, low dynamic compression, poor idle. Too little overlap sacrifices mid range torque and increases the sensitivity to detonation.

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more overlap can improve throttle response, and increases dynamic compression if the overlap increase was realized by way of lsa reduction. the old man always (always) told me, " it's all about when the intake valve closes." lsa increase will flatten the power band and reduce dynamic c/r, lowering cylinder pressure, and making the engine more resistant to detonation (in an appropriate combination).

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He had the Overlap info incorrect. A tight LSA will have a higher cranking compression