firstly - let the car warm up completely then check, when cold the ECU will run it rich making it smell of petrol at the exhaust and steam out some condensation too. When normal hot - the ECU will go into closed loop and lean out its mixture to sensible figures and clean out the exhaust emissions including water condensation.
Your carburettor also has temperature controlled functions (the cold autochoke e.g. which increases fuel mixture and rpm when cold)
The mixture of gunk you see in the exhaust pipe is accumulated sediment in it - every car has it, be it new or old
