It's your Jeep, so expose it to as much abuse as you would like. A blown water pump is not a disaster....that's just normal maintenance for a 50 year old vehicle.
I would be very surprised if you could hear a water pump vane break. But if the water pump bearing is shot, perhaps that is where the noise came from? If there a lot of play on the fan?
I would suggest topping up the rad with water and leaving the cap off for the couple mile trip. I have seen too many Jeep blocks crack in the center between the #2 and 3 cylinders because of overheating. Unless the leak is of biblical proportions, you should be OK. Your temp gauge will tell you, however they are slow to report if the coolant level is very low.
Shifters: Normal driving. First lever on the transfer case (2-4wd) is all the way forward....it should just about hit the defroster deflector lever. Second lever (H-N-L) is all the way back. There should be a little data plate nearest you on the batch of data plates showing the shift patterns.
Better rich than lean. A cold engine can cause what you describe, leaving the choke on, or merely setting the mixture screw. With the engine hot and running smooth, turn in the mixture screw until the engine starts to stumble. Do not jam the screw all the way in. Now back it out until the engine reaches it's highest idle.
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