Yes, the Viggen had a 2.3 liter B235 engine (see pic below) whereas the Cobalt was the GM Ecotec that was used in the 9-3 SS (the generation after the Viggen).
You're correct, they are hard to find. I actually still have a 1960 Austin-Healey (Bugeye) Sprite that's been in the family for 41 years. The Sprites and MG Midgets are quite similar given that they were produced at the same factory in Abingdon, England.
-Mike
I have a 2001 Viggen and it has been without question the best car that I have ever owned. Great blend of performance and comfort and yet I consistenty read negative comments about them. Makes me wonder if the authors have any firsthand experience or are, instead, afflicted with personal biases...
I still have my 2001 Viggen and, like you, have always loved it. It's presently getting a Stage 5 Nordic upgrade (which will put it at 480hp) but will soon be back to sharing garage space with the 2010 GTI.