Carb Tuning

Jumped timing? I doubt it. If you turned the distributor clockwise, it would have retarded the timing, so you might want to put it back where it was. If you loosened the clamp bolt a lot, the distributor may have retarded itself due to internal friction, but the cure is the same, just advance the distributor. If your timing changed substantially, the distributor didn't "jump time" (it cant) something broke like your cam sprocket.

You sure you didn't knock a wire loose?