if you boost a carb car how hard would it be to fine tune it. And can u boost with a stock carb.

The carb must be modified, a better fuel pump will probably be needed and a fuel pressure regulator must be used.

you've also got to pressurize the entire carb (inside/outside) by boxing it in...
if not, the pressure on the outside would kill your float bowls.

If the car originally has turbocharger it is very easy. You can get extra HP tuning the screw of CO carburator ( in order to avoid knock ) and the nut of the waste gate turbocharger.

But If the car has an atmosferic engine you must modify many parts (exhaust mainfold, cylinder compresion ratio, carburator.......)