I'm not sure specifically what the 'big sal story' is. It could be a personal story about someone named Sal, or it might be a local or family - related story. Without more context, it's difficult to tell.
The arcs where the Hulk has to face his inner demons are also great Sal Buscema Hulk stories. He has a unique way of showing the Hulk's internal struggle, not just his physical battles. You can really feel the Hulk's pain and his fight to control himself or just let loose, and it's all enhanced by Buscema's art style.
I'm not sure specifically about the 'big sal gas station story' as there could be many different stories related to a gas station. Maybe it's a local story about a guy named Sal who owns a big gas station. He might have all kinds of interesting customers and experiences every day, like the time a famous singer stopped by for gas and he got to chat with them.