67thru69 camaro/firebird drivelines are not interchangeable. It makes sense that it was too long because they made it to fit a Camaro. Inland Empire Driveline should have known this...and should shorten the driveline for you for free hopefully. Shortening a driveline is no big deal. I just had one shortened and balanced, with new u-joints, and a yoke for about 200 bucks.