Yes you could slap it together but it isn't recommended. It is wise to build the motor up while it is apart so you don't have to bear the cost of building then rebuilding becuase now you want to take it to a higher rpm.
If you want 2 liters go with a LS block that is sleeved to 84-84.5-85mm. Pistons, rods, crank girdle, vtec water and oil pump, new thrust washers, rod and main bearings, seals and gaskets.
I also recommend you go with a larger differential with your S4 tranny.
Milan