[mustangman65_79]

One last thing I forgot to post, if u go with underdrive pulleys, you may get more free'd up horsepower, but unless u race all the time, your underdrive pulleys will give u problems on the road, your powersteering will be slower, car may run hotter becuase of less water runing through, and you alt may not completly charge your batt. So u need to decide mostly track, or mostly road.