No, the Grand Marquis is RWD, same as the Crown Vic. The Lincoln Continental has been FWD for a while.
However, I think that you are correct about the bolt pattern for the 4.6. It would require some more investigation at the very least.
You can use an AOD from the older Grand Marquis with the boxy styling and the 5.0 V8. My current AOD is from a 1989 Grand Marquis 5.0.