So just an update. I did some more research, and it looks like the driveshaft would need to be shortened by about an inch. Otherwise, it could bottom out inside the tail shaft of the transmission. A friend asked if you could machine the input shaft and bearing retainer to shorten them to a Fox body length. Althugh that sounds easy, I'm afraid the splines may not be in the correct position. So I'm more than likely going to just swap the input shaft. Its not a hard job from what I've seen, but just have to make sure all the bearings come out and it's shimmed correctly. Has anyone else done this? Anything else in should keep in mind?
2000 Mustang GT-Former giggle gas addict
1990 Mustang GT w/ Vortech V3
***resident gun idiot***