Bumping the FSB from 333 to 433 will definately change your clocks. Make sure you save the changes when you exit your bios, otherwise they wont take effect.
FSB is the only way to overclock unless you have an Extreme intel edition or a Black AMD chip.
If you dont know what speedstep is, then you will have it enabled (because the default is ON). Basically its a method of saving power by decreasing the CPU multiplier when the CPU is not being stressed.
So just looking to check that your getting the speeds you want you will have to either disable speedstep (check your motherboard manual) or just run a reasonably intensive program while in CPU-Z like SuperPI or Prime, IBT, a game, whatever you want. When you do this the cpu will up its multiplier to the maximum and you will get the accurate speed your chip is running at when it is loaded.