As mentioned, if it's a regular drag car, then you'll need to upgrade the rear and the trans significantly.
If it see's the occasional track day and regular street driving
, then you should be ok
You can hit the track once without a roll bar and get you're #'s.
They'll warn you if you're under a certain time, or tell you to lave until you've installed the bar/cage.
What kind of SC are you using?