Customer bought online tube ss brake line kit and fuel lines...

[SnapOnBodytech87]

So I'm restoring a 1970 gmc c10 for a guy. It has a 400 motor, turbo 400 trans, 2wd lwb with a wood floor. It originally was on a 3/4 frame, but he got a 1/2 frame with trailing arms. It's all blasted and painted and it's up to me to reassemble. It was mostlytorn apart when I got it, so I don't know where everything goes. All the suspension type things I can handle fine but the brake lines that he bought and the fuel lines don't make sense to me. Personally I think it's the wrong brake line kit and I think I'm missing at least one fuel line probably a return line. The frame has disk brakes on the front with the brackets for the flex hose to join to the hard line on the front side of the engine cross member. So keeping in mind the frame I'm trying to build is not the original one for the body here are my questions.

How many peices some in the stainless kit for lmc(packaged as inline tube)?
I looked up some pictures of original lines and how they are run and there is cross over 3/16 line going underneath the motor mount brackets, my kit doesn't have those.
The 3/16 lines that run along the engine cross member don't seem to line up to anything at all. The line coming from there rear is at least 2 ft too short. I double check the part number in the catouloge and they match the box they came in. Has anyone had any of these problems? Should I just get some stainless line and make my own? Is it a packaging error? Did I get a kit for a truck with front drums? Or a short box?
Which proportioning valve do I need? And unions and t's?
Also should this truck have more than one fuel line? I have a 3/8 2 peice line but have no idea how it runs, which end is which, and if there is a return line, it is listed for the truck?
It's driving me nuts, I'm trying to do this part quickly for the guy but just ended up wasting a while night staring at it!! Please help, could some one post as detailed picsof the brake lines, proportioning valve and fuel line for this year and possibly motor? Please it's stressing me out lol 😁