I looked at this yesterday and I couldn't imagine giving much of an idea being to me cars seen in person can change tens of thousands of dollars in value.
I don't have a clue on todays prices so I went to Ebay to "Completed auctions" to see what they have been going for, wow, not too much to go on.
And then 1967 too.
I am amazed at how little some of those Camaro's go for, wow.
But honestly, I have to tell you having just finishing up a convertible, a convertible adds a LOT of extra crap that can go wrong, and expenses. So unless you are really ready for those extra expenses and work, don't mess with a convertible. What I would be looking for would be rust and repairs. If I were looking for a car like that I could give a rats butt about how nice the motor or interior looked, I would be crawling around that body on the floor and in the trunk and all over to see what shape the body is in, THAT is what would be the deal breaker for me. If the body is clean and unabused, I don't care what the motor looked like or interior or paint, that is all pennies compared to if the body has been hacked and rust hidden or that sort of crap. And believe me the convertibles can be rusted out BIG TIME.