Re: EFI fuel line
At 690HP in your signature, you need 1/2". NO HOSE, the high pressure of fuel injection will permeate fuel smell like crazy, you will have to move out of your house the garage will smell so bad. Been there done that. IF you cannot lower the subframe to snake the line through, I would find someplace I could cut the line, and then flare and reconnect the line with steel female tube nuts and sleeves with a -8 male / male adapter.
You probably do not have a 1/2 flare kit, most do not, your local hydraulic shop can most likely flare the tube and supply the steel fittings to reconnect.
Just make sure wherever the reconnection is, there is room for the bulge of the fittings. this way you will have a safe, none smelly fuel system.
BTW, if you do this right, you could put the fuel filter at the cut and reconnect.