Overclocking the system by replacing the 24MHz oscillator is not going to change any games. As that is the master clock, every other clock is derived from it proportionately and will scale alongside it. No game would know the difference; the parts are not being run against their theoretical limits as is.
To get a refresh rate of 60.00Hz, the 24MHz clock must be replaced by a ((60.00Hz / 59.1856Hz) * 24.00MHz) oscillator, ~ 24.33MHz. Not a common value. The CPU clock, the pixel clock, the YM2610's clock, the audio pitch, the Z80 clock, etc. will now all be increased by about 1%.
If you do that, you're also going to up the horizontal frequency by 1%, getting about 15.7KHz. That's within tolerance, but you might find a display is just as picky about that.
It's all a matter of proportions.