A 833 Transplant: Trunnion Flange to Slip Yoke Conversion

Just getting back into Mopars, so I'm not exactly sure whether I have the flanged output shaft to accommodate a trunnion ball u-joint (specific to 1964 and 1965, I believe) but anticipating this is the case, I need to know what exactly needs to be done to make the conversion to the more popular slip yoke design. FYI-I will be replacing the existing A833 transmission in my 1964 Plymouth Valiant with an A833 from an early 70's Dodge Dart. Will all A-body driveshafts with a slip yoke work? Would the donor driveshaft need to be from a 4-speed car? Little help here...