If you have the space, just store the parts you take off, so it can always be changed back. The swap you are talking about does not permanently change the car.
My vote is the 5 speed, as the OD is nice, and you can buy a rebuilt 5 speed cheaper than an unrebuilt toploader, plus there are 133 (?) different toploaders, not even considering the SROD's, so getting the right one could be a challange.
Drive Shaft: Spring the bucks and get the CORRECT length shaft in aluminum, and have in balanced. I have no personal experience, but I have read that Crown Vic's make a good donor for the drive shaft.
You will also need a new speedo cable, depending on what transmission you use.
Another item is you can hook up an oil cooler and run in through the radiator bottom, where the existing trans cooler is already built in, just flush it well first.
If you have a console, it will need a different top plate.
Lastly, make sure you jumper the neutral safety switch wiring, or the car will not start after the swap.
Bob
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