Need some advise on fuel lines

[ford1997]

Hello I'm in the middle of replaceing fuel lines on my 1997 f350 psd. The lines I'm replaceing are the steel lines on front of motor and the flex lines they connect to. My problem is that I can't figure out how to snake the new lines down the front of motor. I've already removed ac and vac pump and pwr steering pump I cut the old ones out cause they were pissing me off. Any hints or suggestions would be great. Thanks