Over the bell housing then over to/above the frame. Runs mostly above the frame to the rear heater. I didn’t put much more thought into it than “stuff it down here and keep it away from moving parts”. Many zip ties holding the hose in place to various “things”
I replaced mine with heater hose, ran it along side the frame tucked up. Left the old rotting lines in place and simply bypassed them. It has held up this way for 6 years so far without issue.