If you go really high compression, you won't be able to turbo it later. But from what I've read, turbo is a real pain and takes a long time to setup and tune. Doesn't seem worth the hassle when I've seen N/A slants in the 11s.
If this is street/strip I would aim for mid to high 9s compression. Cut the car's weight where possible, run headers and 2bbl carb with 2 1/4" exhaust. Electronic ignition, and dump all that smog stuff.
