Hedman Headers Won't Fit

68 Cuda with a 318, power steering. Originally had single exhaust. Plan has been repaint, dress up and mildly add to motor., and convert to dual exhaust. Got Hedman Headers a while back. Pulled motor and tranny this weekend. Tried to give a look see at headers to see if they fit, because eyeball test was saying no. Now I have to say it looks like no way. Anybody have experience, suggestions with this?