Hi Dave,
Values for that cpu would be 11.5 x 133 giving you the 1.53 the chip was rated at, although overclocks of a whopping 200 mhz were reported way back then!!
believe that the board you have was not set up to take ddr 200 as the max supported was 166, so make sure it is not the 200 or that may well be the reason you are not getting a boot.
Couple of things, you haven't told us what GFX card you are using as sometimes overclocks on old Athlon boards were inhibited by the GFX card and they needed to be overclocked as well.... let us know what you have and make sure it's not an 8 x......as it was only AGP 4 x the board supported!!
Hope this helps