What sort of problems have you had? Are the wires physically damaged? Is it a hacked up mess with crimps and splices everywhere?
I agree with BJSoder. (and kaygee who replied while i was typing this). If it is really bad it's gotta go.
On the other hand, most goofy electrical problems that defy fixing are grounds, and that is easier to fix. If something, like a light, is ungrounded, the electricity will try to "find" a ground through something else that is supposed to be grounded, usually at the same spot. For instance a dual-filament taillight will bleed current from the signals or brake lights into the taillight circuit, and vice versa.
Rhode Island WIring, and YnZ make wiring harness for old cloth wired prewar cars like mine, and probably have stuff for newer cars with PVC wiring like yours. I would call and ask.
http://www.riwire.com/https://www.ynzyesterdaysparts.com/Painless Wiring, and a couple of others make kits to rewire any car to a system much like the wiring in a musclecar-era American car. This costs less, but is universal fit. It is appropriate for highly modified cars, but I wouldn't do it to something that is close to stock. There is just no substitute for parts that fit right, and wires that don't need splices.
One hint, Chevrolet has, on some occasions, crimped steel bulb sockets into an aluminum reflector, and the ground fails where the two metals touch. It looks ok, but sometimes it isn't. On a car that will not be shown competitively you can solder a ground wire directly to the steel socket, and run it over to a screw on the body.
Welcome to the forum! Ask all the questions you want. There is an amazing body of knowledge here.
