Pinion angle

Having a 68 Barracuda with a 340 " Tf727 and 8 3/4 rearend , I have mounted Super Stock leaf springs , my qestion is what is the best angle of the pinion ,how many degrees nose up or nose down . Ive beeing reading the Direct Connection Racing manual and they are talking about 0-5degrees nose down but that must be specifications for the strip ! I will go 95% streetwise ! hope for answer , Janne!