drag coefficient rating??....

I have a 86 mustang gt and a 88 lx...and i was wondering what is the drag coeffciency rating on them and all fox stangs..do's anyone know where can i get this information...im pretty sure the 86 might be higher cause of the head light sockets...but i looks like it would be more aero if there was headlight covers on it....

thanx for the info..imma get the book...im trying to figure out they ways to make my 86 it bette maybe lowering and headlight covers will help..but if im thinking correctly...wouldent the cars with higher drag eff rating be more stable at higer speeds...cause it has more downforce..or am i wrong about that assumption???