If the motor mounts are broken slightly (ripped part way), how much will it effect acceleration? Will it cause any funny reactions under hard acceleration?


No, you won't have to worry about the crank, you'll need to be aware that, that horrible ripping sound is the fan chewing up the shroud.
Hope the shroud isn't the metal kind, if it is then you'll need to buy stock in your favorite fan mfg.

There is just a small crack in the top of shround so far, but other then that it's good. I'll have to fix them mounts, then deal with this whole engine performance deal (see ignition/carb post).