You have to be kidding. Why are you even asking? You need to get your tail down to the bank right now. do you have ANY IDEA how much true "six pack" cars are really worth?
By the way, there's no such thing as a "General Lee." "It" was NEVER MADE by Dodge, "it" was thrown together by the Horrywood prop people. So when you say "it doesn't have the flags" all that means is, that some kid with a spray gun didn't hose a Confederate flag on what would otherwise be a 'perfectly good' Charger
A "real" six pack car in any body should be worth many tens of thousands of dollars if it's in any kind of runnable shape. Not long ago, an original B body six pack car, with no engine or trans, and certainly not restored, went for several thousand.
However, you have to be careful:
Notice that the seller DOES NOT CLAIM that this is an original six pack car, and that makes a huge difference. ARE YOU SURE this is a six pack car? Have you decoded the serial number?
I have to be honest with you. If you have to sell your other cars, you probably aren't in a financial position to deal with this. Properly restoring this car would be very expensive, and if you get done, you'll have to make a decision--can you afford to keep it and store it properly--like money in the bank, or will you have to sell it for a very large amount of money?
the above dilemma is why ALL of us aren't doing this. I once owned several of these types of cars, and now that I'm older and poor, I could not afford to go out, spend 12 grand, then dump, what, another 20-40K into it for restoration, keep it garaged, and live enough to reap the huge investment?