Where did you get the "all Y3/snakeskin were /6" info.
That sounds a bit fishy to me.
All "old cars" will eventually be worth something.
4 door 50's cars are now even bringing respectable money because no one can afford the 2 doors.
Logic says the "next in line" cars will be high or rare/desirable optioned cars.
Right now I'm in the market for a v8 manual trans, fold down seat a/c Duster, in an appealing color.
That being said, cars with rusted frames are probably not a cost effctive proposition unless they're REALLY valuable.