belt length

I have a question. Do you get enough wrap on the back of that water pump pulley to keep it going and keep the car cool. I have a half wrap on mine and when in boost the belt would slip on the water pump. You just don't have much contact to that pulley. Use a material/clothes measuring tape to get the correct belt length measurement.
 
I would worry that your water pump is not going to run, like said above measure the distance with a taylors measuring tape.....or a piece of string, then measure the string with a ruler or tape.