If you do a search, the differences are usually an 1 inch. Sometimes + and inch sometimes minus an inch on the same model year car. I'd just wait til you changed it and check. I just did this swap and had a new driveshaft made bc I don't know how long an old one will last behind a 470" stroker. Plus I was going to have to change u joints anyway with the strange 60 going in. Hopefully my driveshaft shows up this week and my swap is complete.