Regarding #3 above, many prefer the dual mount points provided by the type 2. The vendors have a kit that converts type 1 to dual mount points. It attaches to the sway bar mounts on the car and then attaches to the three bolt points on the transaxle. The same kit may work when putting a type 2 transaxle into a type 1 car.
Regarding #4 above, the speedo cable is likely different. The cable for the type 1 is harder to find than type 2, and most of the vendors have type 2. It's not the transaxle that's different, it's the speedo adapter on the transaxle. The type 1 came with a different adapter than the type 2.
Aside, my vendor says the type 1 is a stronger unit than the type2. They ran the type 1 in some of the GT40 race cars. On the downside, the type 1 be can difficult or expensive to get parts for. I currently have cars with both types and I can't tell the difference when driving them.