Quake and ChadQuake framerate

Hey everyone, this is the guy trying to do the really pedantic authentic Quake playthrough again. Thanks for your help so far.

I have yet more questions:

1. The original DOS executable ran at a framerate of 72 FPS right? What about WinQuake and GLQuake?
2. In ChadQuake, I'd quite like to play at 240 Hz, the native refresh rate of my monitor; has ChadQuake or Mark V it's based on implemented a fix so that higher framerates don't affect the physics?
3. When the Mission Packs came out, what was the optimal way to be playing it? Still the DOS executable, or one of the ports? What resolution did the people with higher-end systems play at?

That should be all (hopefully). Thanks.