Been researching these cars for quite some time and finally made the plunge earlier this week, picking up a '67 coupe.
My project is to build an exacting replica of a '67 Z28, perform some very mild modifications, and go race the car with the SCCA. I go into a bit more detail about it in my blog:http://www.rhoadescamaro.com/build
One thing I haven't been able to figure out, is what final drive ratios were available to the Z28 in 1967. I know the 3.73 was standard. I've seen conflicting things about the optional ratios. The 3.53 is okay but I am also interested in running the 4.88. In my weird case, there don't even have to have been any cars actually delivered with the 4.88, only that it was an available option that year, from the factory. I've practically memorized the options.pdf from this site - is there any sort of scanned in ancient factory order options sheet or something like that?
I already have all the factory books, and Jerry MacNeish's and a couple other books on order. Hoping to find the answer.
Thanks so much!