After reviewing the posts, and getting a phone call from my '68 parts expert/Camaro owner/best friend, I think the proper length is likely 61 in. My original cable is still hooked up in the car, or I would have checked the replacement cable against it. Another episode of post-before-you-check-it; please don't hold it against me - just trying to help.
Anyone need a new 56.1 inch new cable assembly ?
Steve, no problem! Dang, I do that all the time.....
Hey, got an idea, put the cable on ebay......