I personally don't care how much it's worth. I'd just like to have it restored and drive it around because its not something commonly seen on the streets.
When was the last time you saw a '68 Impala going down the road?
Back in the late 80's I kept driving by ugly green 66 4 door Impala with a for sale sign sitting on the side of the road. After driving by it about 20 times over the next few days, I decided to stop and look at it. It was in fairly decent shape, still ran, but the air conditioner didn't work, and down here in Texas that is a must. I contacted the owner and he wanted $700.00, which back then was probably a good deal. I knew I would have to put some money into it, so I offered him $400.00 and to my surprise he took the offer.
The car ran, but the front end was loose, and like I said the air conditioner didn't work, so I took it down to my local shop and had both fixed. This car turned out to be my daily driver until I was involved in an accident where a Ford Escort crossed the center line and hit me head on. It was not a high speed accident, but I was sure glad I was in that tank. I loved that car, it had manual brakes and steering, and at the end I was running 8 anti fouler on the plugs. The car never let me down. It was too damaged to fix, because parts were hard to find, so the insurance ended up totaling it.
I have had new cars before and after, but I really think that was my favorite.
If you like it and have the ability to restore it, then my vote is to go for it. The car is talking to you and I learned a long time ago, if you start putting a price on everything you want to do, you probably won't do anything.
Fred