A "350" typically refers to the Chevrolet 350 cubic inch (5.7-liter) V8 engine, which has been produced in various configurations over the years. The horsepower output of a 350 engine can vary depending on the specific model and modifications. In general, a stock Chevrolet 350 engine from the past has produced anywhere from around 145 horsepower (in the 1970s) to over 300 horsepower (in some high-performance variants). However, it's important to note that engine power can be significantly increased through modifications such as aftermarket components, tuning, and performance upgrades.