You can boot 98 from a CD or thumb drive and do it that way.
Only one person above mentioned the playfield glass. The playfield glass is unique and a scratched up glass WILL affect your enjoyment of the game. Everybody wants to talk about LEDs but who cares about LEDs if you're staring at it through a scratched up playfield glass that is hard to replace? Marco has them listed at $239 each before shipping.
The PC is old but not impossible to replace. The prism card is propietary and very hard to replace. NuCore's main role initially was to do away with the need for proprietary NLA hardware and make Pinball 2000 easier to support. Now NuCore is proprietary NLA software that is difficult to get and we're mostly back to where we started.
The monitor is not as specific as people are saying. Yes, a drop in no work replacement is one of two specific monitors, but other 19" raster arcade monitors can be used. You would need to adapt the video connector and mount point of a PCB or two. It can be done by anyone who knows monitors. The game benefits highly from a video amplifier mod that can be found by searching this forum. An LCD can be used instead with a 15khz->VGA converter in a mod also found in the forum.
Check the ramps. These are still available, I think, but not cheap. Check the scoop hole for wear and the scoop weldment for breaks. That thing gets hammered. Check the spring steel ramp that gets pushed up during play. That breaks a lot but can be repaired with an inexpensive kit and a cheap rivet gun.