I'm not sure, I'd have to look at my initial design again first and follow the lines. IMHO, the length of the line does not matter as it is all pressurized. Basically all I did was swap the return and feed on one side and T the inputs/outputs (before the stock rails where they attach) so I could keep the stock bottom hard lines (I don't want anything to kink and blow a piston). You could do this with the mani on as well.
I just needed one adapter though and the fuel line fits right on the stock FPR fat end like on the scoobymods tutorial. I ended up using less than 2 feet of goodyear fuel injection hose.
EDIT: The length of the line after the Ts does matter, see my posts below