New member with project truck

[68C30Flatbed]

Hi everybody, I am a new member. I live in Newberg, Oregon on a small farm. I just bought a 1968 Chevy C30 1-ton dually flatbed with a 327 V-8 from a local farmer. I have already started browsing old threads to resolve my headlight switch problem and am sure I will be visiting every day to find old answers to my new questions. Thanks in advance for those! This is a great resource!

It's immediate needs are:
1) Fix rear brake leak. There's a leak just behind the master cylinder.
2) Fix headlight switch. Running lights work, new headlight doesn't, so problem likely is in the switch.
3) Rebuild carburetor. Is balky to start and idles rough until warm.
4) Remove old bed rusted hardware and install new bed wood.
5) Find a source for removable box enclosures for it. (12 foot long bed) Help?

I have edited in two pix to show the truck and engine.

-Paul