carburetor problem?

I have a 64 dodge dart and was wondering if the following is normal or not, and if it is what can i do about it.
My dart when on and being driven smells like gas, a lot and i was wondering if that is normal or not. Another thing is that when i am driving and i hit the brakes really fast and brake hard the car will sputter and turn off, or just turn off. I would appreciate some help on this, thanks.