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Fuel problem w/ O2 sensor connected

Fuel System

Vehicle Information: Year: 1986; Engine (Size, Modifications): 3.3 liter, 1 bar boost, custom free flow exhaust; Total Mileage: 58,000 miles;

Engine runs smoother,better, & has more power w/ O2 sensor disconnected, and should I set the CO to 2.5-3.0, or what do you recommend? With O2 sensor connected, engine hesites and runs lean, poor performance, will I damage the engine w/my O2 sensor connected. Can I also replace the smaller U.S.A. injectors w/ euro injectors and w/ out replace fuel dist.? I have also advanced my ignition timing by 2 degree's, is this O.K.?

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