> Is the car going to be sluggish off turbo because of the setup?

Not if you leave the engine stock and just add a turbo. It'll have the same power as before, but when the turbo comes on, it will have even more.

> What revs would you expect turbo to hit?

Same as before. You are limited by the cam and most especially valve springs.

> roughly what sort of gain would a stock motor get in terms of power?

40%

> would any modifications to the motor make it better suited for turbo application?

Yep, same as any other build up - bigger valves, ports, carbs (freer breathing) ... with the big exception that lowering the compression ratio will help. Then you can use more turbo boost on the same octane fuel. On the other hand, lowering the compression ratio will make the engine have less torque off-idle, before the turbo spools up. Depends on what you want -- max hp, or just a boost to your stock engine.

There is a lot to this subject, check out some of the turbocharging Web sites or books at the library.