Slant 6 questions

My 15 year old son recently bought his first car, a 1970 Dart Swinger. The car has one re-paint but is otherwise very original. It has a slant 6 and I believe it has only 89,000 miles on it. Where is the VIN located on the engine block? Also, he needs a negative battery cable. Are the cables the same as a V8? I couldn't find any cables that are specific to slant 6. He also needs a fuel line that runs from the fuel pump up to the carburetor. Is that a part that is readily available? I've never looked for slant 6 parts before.