Pac’s style is very obviously Bay influenced. You can hear Spice, The Governor, Richie Rich, etc. It was more so the cadences and certain words that he used which gave it away.
You can say that Pac for the most part was a Bay rapper but had enough East Coast influence to come off a little different. But yeah it’s super obvious that his foundation as a professional emcee came from his time in the Bay scene. Also agree with Greg that brought up Scarface, Pac was definitely influenced by him as well as Cube to a lesser extent.
You can hear the Bay influence in this song imo.