Drive shaft measurement

Thanks for the reply. There is a guy not to far from me who states that he has a drive shaft from a 1969 Dart that had a 340 and a 727 with the 8 3/4 rear end, but since I have nothing to go by for this 68 Barracuda I am just going to look at un-familiar parts, a length from center to center of the U joints would be help full. NBDART I do not mean to hijack your thread but since the topic is being discussed I hope it works out for anyone else that needs it also.
Thanks
Bob