I truthfully had never thought of that before, so that's why I mentioned it, when I saw what you wrote. I thought that it was a great idea to be able to use the bigger block for more power, but keep all the simple and reliable stuff. It's the best combo, so thanks for pointing out yet another reason to do this motor Even if you don't go all "crazy" with the cams, I still think that this is a good way to go. Best of both worlds.
I was kicking this idea around in my head for a while. When my 2.2 started smoking more than I liked, I decided to see if I could do it. I was never really that impressed with the power of the 2.2. It was neat, and Brat suspension/brakes were overwhelmed by the power, but I was still underwhelmed. Now I'm trying to come up with ideas for suspension/brakes/transmission, since all of those things need to be redone now. I actually thought about a sequential-wannabe transmission similar to your 4EAT setup.
If you went with a similar motor, I think you'd shoot yourself in the foot by not installing the torque cams too. From what I've read, they're an improvement over stock all the way until the heads can't flow anymore anyway. How much time do you really spend above 5500 RPM or so?