What is the horse power of a 5.8 ford motor?

There's no single horsepower figure for a "5.8 Ford motor." The 5.8L (351 cubic inch) engine was produced by Ford over many years and in various configurations, each with different horsepower ratings. The horsepower varied greatly depending on the year, model of vehicle, and specific engine modifications. You'd need to specify the *year* and *model* of the vehicle the engine was in to get a more accurate horsepower rating.