The motherboard will likely cost too much. It would be better route to get a low priced motherboard, RAM and processor with more modern technology. Pentium 3 processors are really slow compared to AMD 65 nanometer processors.
An Athlon 7850 Kuma Dual-Core without a heatsink is only $43 at NewEgg.com presently.
Yeah, still got some old Pentium I/II/II and AMD K-5/6 around. Hate getting rid of some of the old stuff. Second though, I could have got rid of them a few months ago though. Would have to look around.