L36 rails won't work for you. The injector spacing isn't correct. There is no aftermarket or current market solution. You're totally custom, and believe me, I've been there before. It'* much simpler to EXTEND the rail with custom spacers, but that gets very expensive very quickly.
Your best solution (yes, I know what you're doing) is to cut the rails and flare them at the front and rear supply and return, then use flex fuel tubing with double hose clamps. There is danger here due to the fuel pressures we run, particularly if you end up bumping up your fuel pressure (and you will have to with what you have planned).