Re: racing a klde
Sorry for not responding earlier. Oil pan, not sure. Older cars with more room would put a deeper sump on the bottom of the block, if you have the room, you'd probably have to have something custom made. The other option would be to weld baffles in the existing sump, but you have to be careful as to not interfere with anything in the engine. I'd suggest leaving it as is and take a trial run to see if it's going to be an issue.
Rev limiter: depends on which one you buy, MSD carrys one that backs off the ignition rather than dropping it, but not sure if it's badge specific.
Not sure about the KLDE, but if you look on the output of the Probe's gearbox, you'll find the speed sensor, pull it and see if it looks like the end of a standard speedometer cable. It probably has an input to the PCM, but if you're using it for racing only, it should be just a nuisance diagnostic. After seeing the Prpbe's speed sensor, I'd say it's very likely.
Prius repellant, just add gas.