So many people don’t have a good word to say about the 70’s jazz basses, I personally think they are a great piece of history and when you get a good one like yours it’s definitely worth keeping and enjoying 😀. Alain m on YouTube had a lovely 74 jb which I just missed out on buying a few years ago
If you are interested in the modes this is worth a watch , he basically breaks them
down into their arpeggios , the 1st , 3rd ,5th and 7th note of each mode ,
I’ve been playing bass for years and up until 4 years ago I didn’t even know what a mode was so I started studying bass theory and the more I read the more things fell into place. This chart maybe of use to you 😀 Daric Bennett has some great lessons on them