How much horsepower does a 350 030 over have?

The horsepower of a 350 engine that has been bored 0.030 over can vary depending on several factors, including the specific components used (like the camshaft, intake, and exhaust systems) and whether it's been modified for performance. Generally, a standard 350 engine produces around 250 to 300 horsepower. With performance modifications and tuning, a 0.030 over 350 could achieve horsepower in the range of 300 to 400, but exact figures would depend on the specific build and setup.