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The code is basically telling you that the purge flow is going the wrong way, not that there is a leak. So it sounds like you just have some vacuum lines connected in wrong locations. The vacuum solenoids are similar for either engine (3.1L or 3.8L). I would first try switching the two vacuum lines around that connect to your purge solenoid if you haven't already tried that yet. Otherwise I would just ensure that all the lines are connected to the correct places. It doesn't sound like you should need to replace any parts. Does the engine run and idle ok?
My '95 Regal 3.8L has two charcoal canisters (I think...I'm not sure if they both are really charcoal canisters, but one of them is for sure). Both of which are on the drivers side. One is up front and sits under where the battery sits. The other one is in the back of the car, just behind the gas filler neck. Your '96 Regal should be similar.
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