A plethora of evidence suggests that the speed of light and radioactive decay rates have been constant for billions of years. Any possible variation thereof is very tiny indeed. I carefully lined up some of the known evidence in a in a previous post on another thread if you want to bother to look.
Havoc, I've gotta say, I looked at your gallery of artwork on your homepage, and I think you're quite an impressive artist (no joke). I can't draw or color like that. I have an idea - you don't try to do science (at least until you learn more) and I won't try to do color drawings. The world will be a better place as a result.
Not to mention that the "fine structure constant" has not changed in over 13 billion years.