The car is worth whatever someone is willing to pay for it. And just like many artists, their work is worth more after they pass on. Thats what this is, a original piece of art from famous artist.
I'm glad to see someone put it back the way Ed had it. there is a picture of it in Tony Thackers book about Roth From after he(Ed) sold it. Almost unrecognizable as "Tweedy Pie".