1980 Mustangs equipped with the 3.3L engine had a Model 1946 (1946C for California) carburetor. These carburetors are complicated, hard to adjust properly and do not offer very good driveability. If the car is running smoothly and getting reasonable gas mileage, I would leave the Peugot carb in place. BTW, my son's '85 Mustang has a '78 Fairmont 3.3L engine with a Chevrolet carburetor. Those of us outside the US sometimes have to make do.
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