I bought the kit from prestone for backflushing your cooling system and it doesn't say exactly where to install the T fitting for the hose. I have a 1992 camaro rs with the 305 tbi. Which line does the T fitting splice into?

 

line going TO (direction of flow towards) the heater core if i remember correctly..

 

There's 2, is it the one going from the core to the manifold? In the instructions it says to put it in the line going from the core to the water pump, but instead of going to the pump it goes to the manifold. Is this the right line?

 

Here's the picture again: