OK, great, making progress. You can just leave that as it is now so long as the connection you made is good (like not just a jumper wire with bare ends). I is a ground so there isn't any worry about sparks and such, but there is of corrosion and the wiring losing contact so you should have good ends at least crimped on (I crimp and solder all of my wires).
What do you mean by "so what do I do now what is wrong here"?
So now onto trying to get it to start and run; first thing you need to do is check to see if the carb has fuel, you do this by looking into with a flash light (definitely NOT an open flame like a lighter); with your hand work the throttle lever (part connected to the cable that moves when you push the gas pedal). You should see some gas squirt into the carb. If you do not, then the carb is not getting gas, if you do then of course it is and you can move on.
Understand that these old Mopars all have personalities to a degree, some like a lot of fuel to start, others not so much. The carb has a choke on it (little plate on the on the inside of the carb near the top), when the car/engine is cold that plate should be closed or near closed (this causes the engine vacuum to draw in more fuel to start and run when it is cold). You can actually simulate this by placing your hand over the carb when it is cranking (either someone else turning the key or using a remote starter button).
As I said before, everything is a system and in order to get the engine to run, it must have air, fuel, spark and compression. If the carb is getting gas, then its a matter of determining if it is getting enough. Normally you would put some gas into a bottom or small can and pour some into the carb (right now the top). You should not need a whole lot but not a few drops either, probably something like you think of would be a "mouthful" if you were drinking something. If you put too much the engine will be flooded and you will need to wait and let it evaporate or in come cases you can hold the gas pedal to the floor completely opening the choke and crank it and sometimes they will start. You can also pull the spark plugs and crank it over a little which pushes the air/fuel out the holes and makes it dry out faster; personally I would just wait.
Assuming you are getting fuel and it still doesn't want to run, you will need to turn to the spark side of things, but lets not get ahead of ourselves since it has run previously I suspect that this is just a fuel issue at the moment.
Just for fun, you need to pour some fuel down the carb as I mentioned before messing with the filter or anything else. If it fires but will not run, then you can start to try and figure out why it isn't getting fuel and at that point the filter would be the first stop.
