Im putting a Vortech sc trim on my 92 and I have BBK underdrive pulleys on it, do I need to put the stock pulleys back on? I thought the kit comes with a seperate crank pulley that bolts on to the exhisting crank pulley and runs the blower off of that, so how would that effect the blower if it basicly comes with a new crank pulley (or is it a crank pulley?)..Im confused....what does the seperate pulley that comes in the kit go too?? please help