Advancing stock cam in a 360?

Back in the 70s and 80s my buddy would advance the cam gear 1 tooth on stock non hp engines. Really seemed to perk them up. I’m thinking it was 8* or more. I’m sure someone will do the math. Kim
Good info, that's the kind of thing I was curious about. I know the theory about how this all affects valve timing but I'm wanting to know how it will actually run from others' experiences.