According to the 1998 Ford Mustang Owner Guide :
The 4.6 liter V8 engine is rated at ( 260 horsepower at 5250 RPM )
305 BHP
225 horsepower, up from 215 the two previous years.
The stock 3.8 V6 has 150 horsepower.
The 2005 Ford Mustang with a 4.0 V6 came stock with 210 horsepower.
150 hp, 215 ft.-lbs. of torque
215 Horsepower Stock
225 horsepower
210HP Stock.
The 1998 Ford Mustang 3.8 was rated at 150-horsepower
about 430 horsepower to the wheels
300 horsepower
The 1997 Ford Mustang GT was rated at 215 horsepower