66 impala 5.3 ls swap with “stuff”

Hello new to the ls world of things. Got the car already swapped. Fun project. Has truck 5.3 with 706 heads, thumpr cam, springs and so on. There was a BTR intake manifold and holly sniper throttle body. 102mm. The BTR came with the fuel rails. For the life of me I can not find any instructions on how to install the fuel rails and what extra hardware is needed. Looks like a fuel line extends over intake manifold over to other side like a bridge. I only see one fuel line compression fitting going to fuel rail on right side. Any help would be appreciated!