Saw this 68 340 4 speed

Yes, but these cars are getting hard to find. and while it might not be worth 19.5k, it could be worth more than that in 5 years, 10 years, or 15 years. There are people out there that buy cars and then just put them in long term storage until prices skyrocket.
Example: about 4 months after I bought my car, two guys in a brand new F-450 stopped in front of my house and offered me 10k for my little POS. Now I debate every now and then if were just trying to get my attention or if they were serious. But IF they were serious, it just shows how much cars are sought after nowadays.

They are trying to manipulate you. Especially if they made that offer without getting up to car and inspecting it. You’re young and they see you as prey.

If your not selling, don’t invite them into your garage or property.