If the timing belt on a 1992 Pontiac sunbird is 1-2 notches off what will this affect?

the cam will open the valve at the wrong time and possible smash them into the pistons

that answer is incorrect.

To the best of my knowledge, the 2.0l engines are "non interference" engines, which means that even if the valves were completely open at the exact opposite wrong time (open when the piston is at the top of it's stroke) the valves will NOT contact the top of the piston.

What makes you think your belt is off that far?