What difference if any is there between the base, landau, and sport models with the 305? Ive always just assumed mine was a base model but when looking at other base models I noticed at least 2 differences and im unsure if they are just options or if they meant anything at all. The base models ive seen have a dash clock and mine has a factory tachometer and mine also has factory AC although the condenser and all that was missing when i got it