Horsepower guesstimation?

Don't focus too much on the numbers. 318's don't usually make a ton of power but they're still great engines. I used to have one in my Dart and it while it doesn't make as much power as my 340, it could still roast tires and was fun to drive. Sounded pretty good too.

Around 200hp might be accurate but don't Fret over it (you'll always want more power). It takes away from the enjoyment of having an awesome old car.