Where were you when I needed you? LOL
It's nice to know that I am not the only one capapble of making a such simple stuff up. It cost me 4 weeks of time but I learnt such a lot of valuable information about the Lanos that I would go as far to say that it was time well spent.
I am assuming yours fired up because the error in the timing is only 1 or 2 degrees while mine is actually about 20 degrees (10 degrees before TDC and 10 degrees after TDC) and retarded. Maybe someone else can set me straight on this.
I think your mistake was somewhat simpler to achieve than mine.
At least you put the gears in the correct orientation when you assembled the car.

It does seem that this problem could have been "engineered" out to the design of the woo with such little effort. I could make a guess that probably very few of the engineers that originally did the design of this part of the engine have ever rebuilt an engine to understand how easy this problem can arise.
That also leads me to think about the way they must manufacture the engine when they do assemble it.
They must install a "timing mark less" set of intake and exhaust camshafts. Then analyse the exact Top Dead Centre position for each camshaft. Finally they must stamp the gears insitu so that the markings are correct.
Therefore, the camgear and the shaft are really a matched set and should always be changed together.
This is all a bit of thinking out loud but still very interesting and might prompt another discussion.