* The vehicle it was in: A 350 in a lightweight sports car will have a much higher top speed than a 350 in a heavy truck.
* Modifications: The engine's horsepower can be significantly altered through modifications like camshafts, carburetors/fuel injection systems, intake manifolds, exhaust systems, and cylinder heads. A stock engine will have very different power output from a highly modified one.
Stock estimates for a 1991 350 in a typical vehicle might be in the range of 170-230 horsepower, but this is a broad estimate. Top speed is even more variable and would depend entirely on the vehicle's gearing, aerodynamics, and the previously mentioned factors. You could expect a range from under 100 mph in a heavier vehicle to potentially over 120 mph in a lighter, more aerodynamic car, *again assuming a stock engine*.
To get more precise figures, you'd need to specify:
* The make and model of the vehicle: (e.g., 1991 Chevrolet Camaro with a 350)
* The engine's specifications: (e.g., whether it's a TBI, carbureted, or fuel-injected engine; details about any modifications)
Without that specific information, any horsepower or top speed figures are just educated guesses.
