I am doing a 1995 3.4 to 1995 Lt1 swap, I have a donor car but the plastic fuel lines going to the engine and metal lines under the car were severed in an accident. Will 1996 5.7 Lt1 caprice fuel lines work as a direct replacement?

 

Sort of hard to understand what is "severed", but if its the plastic line bundle leading to the fuel rail hard lines, they are a fairly inexpensive replacement part.

From Shoebox's part # guide:

1994-1997 front flexible fuel supply lines - 10258441