We have the production break down for 1967 and 1969. I'll dig into the numbers later this week to see if I can find the break down for 1968.
There were 551 '67 Sprint Convertible Firebirds.
The "worth" of the car is relative to many factors, including such things as the color combination. They are typically less than the 400 V-8 cars of the same vintage and condition, even though there are fewer of them. Being rare doesn't necessarily mean being valuable.
