I have a 96 s-10 (v6) with central sequential fuel injection. It has the fuel line that goes into the regulator much like what you describe. This year has only metal and the lines go to the back with a bracket and a threaded connection back by the distibutor. I am pretty sure they are metric threads with the coarse (1.50) pitch. They use them a lot on GM's and adapters are available for this connection.
Maybe you could get one this style from a junk yard? This style has the injectors in a six pack with the regulator and the tubes that go down to each cylinder. (not my favorite design)
Is the line you have completely wrecked? If the end that goes into the injectors is still good? You may be able to just attach to the other end.
Have you used the Army/Navy fittings before? They are good enough for airplanes and helicopters. Nice stuff but a little hard to get together and can handle some high pressures.
A picture may help us see what you are dealing with... It is just a fuel line and it is high pressure (60 plus psi) but people do fabricate high pressure fuel lines like in a retrofit FI set up.
I had a firebird that a previous pump replacement person had cut an access hole and severed all the sending unit lines. I could not find a used one that was not worse than mine. (mn rust) I took it to a radiator guy and he soldered some tube unions on them. It worked great and only cost $20. That was on a TBI so a lot less pressure but I think you get the idea.
Sometimes I have to make what I need because the parts are not available or way to much $. I guess what I am saying is a little creative thinking can go along way...
It is not like the factory set up is all that strong either... It is just plumbing...
