A904 Cooler lines with 5.9 Magnum- like a demented puzzle?
I've installed/replaced a few cooler lines in the car with/without headers..
It takes time and patience,, and sometimes you need to straighten them a bit to get them in,, but it can be done, (I'll never do stainless again)..
I usually push them forward from the bellhousing..
hope it helps