I just checked out the BJ site and noticed that they have three Specials: a 390, a blue one that used to be Seafoam and, interestingly, what looks like THE Seafoam that sold for around $50k a couple of years ago! It will be really interesting to see how it does this time around. Any bets the owner takes a beating?
I'd sure like to know the details of that 390 CS, and what it does go for.
Perhaps someone can keep tabs on that one (and the others) for all of us, as those selling prices can provide a guide of current--or updated--CS values.
My best estimate for GT/CS values is to make a values table (verticle scaled in thousands of $$) where the '68 GT Mustang coupe is on the left, and a '68 GT-350 Shelby FB is on the right. Whatever the "average" auction selling price is of each, you draw (diagonal) line between the two selling amounts on the table, and the point in the middle is the value of a GT/CS of equal condition (and at least a 302 4bbl). You can adjust up or down percentagewise for a 6 cyl, up to a 428CJ. It's a thumbnail scale, but it's a good estimator--or so, I think....
(or....add the average value of a GT-350 FB, and a GT Coupe (J code), and then divide by two for a thumbnail GT/CS value. How's that?)
Paul N.