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I have a bonneville with the same engine. 300,000 mi on it and still going strong.
When the the engine is in closed loop mode (after it warms) it will be relying on the O2 sensor readings. in open loop mode, it uses preset values based on a few other sensors (temp etc). So if you find that the problem starts when it switches from open to closed loop mode that could be a clue.
Why not replace the O2 sensor to start? Its cheap and easy, and worth a shot.
Do you have a scanner? I would monitor the sensors while driving and esp during the transition from running well to running poorly. Look for reasonable readings from the TPS, AMM, O2, engine temp, etc.
btw: http://en.wikipedia.org/wiki/Ward%27s_10_Best_Engines#20th_century
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