drive shaft length? 66 dart 340/727/8&3/4

Unless Breakstuff put a newer tranny in that 65 Dart, I dont think his drive shaft will fit, as it is probably a ball and trunion connection on the tranny tail shaft, 1965 was the last year for that set up. In 1966 they had the standard slip yoke for the first year. But I may be wrong.
Also Barracudas, and Darts are different wheel bases also.
Dave