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How do you know it is running rich? The computer controls fuel delivery. If it is running rich, one or more sensors may be giving the computer false readings resulting in a rich mixture. A leaking fuel pressure regulator internally will also cause a rich issue as well as a stuck open EGR valve. A scan test monitoring engine data can inform you of what may be the trouble
Check for vacuum leaks you can use carb cleaner while its running spray around vacuum hoses and ports if you have a leak it will change the way its running when youare close to the leak it may even make the engine stall or week fire maybe coil bad try vacuum first
po300 is random miss fire doubtful two O2 sensors bad at one time most likely coolant temp sensor is bad causing engine to run rich this will cause O2 sensors to throw a code(thats what they are there for..exhaust gas temp. and raw fuel) running rich will also fowl spark plugs(=miss fire) P1128 ??
Its kind of hard to say with out knowing witch carbuator you have and what kind of fuel its running on or what year the engine is . If your missing a spring and your haveing idile issues i would geuss that it would be the spring to the governor witch is a lever on the side of the engine that should hook to a lever on the carb . its a floating spring and the faster the engines runs it pulls back on the throttle plate to keep the engine from running away . Its controlled by a vane inside the flywheel area that catches the force of the wind generater by the flywheel as it spins faster . The faster the engine runs the more drag on the vane and the more pull on the spring to the throttle plate to keep the engine under controll . This is a basic answer and if you know its missing a spring this is likely where it goes
Make sure the spark plug wires are on right (propper firing order), and check the TPS sensor. Are there any exhaust leaks or vacuum leaks? Did you use the original intake manifolds and Holley throttle body? If not you need to replace the PROM chip with the one from the donor car.