A body tailshaft

You need to check to see what the output spline is on the OD. They came small and large. With a 440 I'd use the large output spline. You basically need the short Mainshaft and short tailhousing. The earlier transmissions should be stronger, so use as many parts as you can from that one. You also need to check the front pinion bearing. It is a 307 or 308 bearing. What pilot diameter do you have in your bellhousing? You may have the right tailshaft housing but you need to check it. The Mainshaft is different from the standard trans and the OD, so you will need to get that.