Joe, I believe the answer is in the, "inhale/exhale scenario",
Yes, I do believe this is doable. Besides I have seven engines etc, laying around, all in need of rebuilding. I am going to try to stay out of the machine shop as much as possible. This block probably won't be bored.
I probably will have about that much in the engine and 3 times or more, in the rest of the car. That said, for the money for the engine I was always told "build it right, turn it tight"
With a 5 speed in it, I should be able to hold my own with most cars in our class, certainly can't take a lot of the newer ones, just give them "a run for their money". After all she's thirty years + old and a lot of improvements have been made in engines. Bonus, only a few of us have an OPEL. So basically, why not do it? My thoughts, and way off topic now.
Jarrell