‘65 cable-shift 904 replacement advice

The transmission I’m installing came out of a cable-shift ‘65 Dart coupe should be the same as the one being removed. Both driveshafts use trunnion-style joints at the transmission end. The photos in the FSM are very poor quality and didn’t really help, and the written instructions aren’t all that good either. Pretty common for many FSM’s I have used over the years. I did find a couple of videos on youtube that were helpful. The FSM also mentions flex plate alignment and marking, so that’s another area of concern. I do plan to check the diameter of the TQ snout, but it should also be the same. The dual-cable 904’s are kind of their own creature, so I’m just reaching out for anything I need to be aware of on this particular job. All the other automatic transmissions I’ve swapped/removed/replaced were pretty simple. Just linkages, lines, and electrical connections. Thanks again for your response.