From a quick glance and reading,
I am not seeing or hearing real problems if you have a good stocked Small Engines
Shop close.

1. I have a late 70s Craftsman’s Saw. The key factor
   is who Sears put their label on vs building. This is not critical on generic parts as
   fuel lines. The Small engine’s shop will know. Even the spring mentioned can be
   considered generic “Possibly”.
2. Get quality fuel line that will cost more but
   will be better spent money and time.
   Good quality line will stretch before you break it. This is needed
   because you will need to cut the line into thin tapers to feed and pull “it
   into the tank and port areas as it seals from the tight fits.
3. The screw is stripped in plastic. Usually I can force the opening open
   with a thin screwdriver in the seam while screwing the stripped screw out
   (replace with a larger self tapping screw X Home Depot or Etc..
4. Please post some Pics of your saw. It looks like it could be a later Poulan
   that Sears put their label on.
5. I hope you know the basics as oil/gas mix, basic
   maintenance and use or get a manual.
6. My pools of oil were from split oil tanks gaskets
   leaking vs later plastic tanks. Or!
   The oil pumps line could be cracked or broken.
7. It is time for some careful disassembling taking
   Pics and notes of problems to share with questions....

I have seen universal fuel line kits a Home Depot and Sears
that appeared as a fair quality of line. The
best and highest priced line has been the Small Engine Shops where the Pros
shop. Installing tips were on the backs
of packs I have seen. Critical thinking
is helpful in any task

I’ll bet your wife can repair the saw as easy as you
can. It's a mind set thing in my opinion
as to what he or she can or can not do.
My best experiences was when girls in the 70s were recruited into
Metalworking, woodworking, Plastics, Small Engines Industrial Ed Classes. Likewise, boys were recruited into Home Economic
Classes. That was the best experience
and showed gender is not an issue

http://www.homedepot.com/p/Universal-Fuel-Line-Kit-AC04124/203791910

Good Luck!