Wait, are you going Digital out or analog out?
If you are going analog out be sure you attenuate (I think the 744t has a setting) down about 10-12db because the XLR out is HOT! So do some tests before you roll or that first recording will bite you.
Anyway: XLRM from the AES2 port from V3 to XLR AES/EBU 1,2 on the 744 is the way to go!
UNLESS you want to hear the noise floor of the preamps of the 744t, then you want analog. Since the V3 both ways of sending out the signal always on, I'd probably run my first test using both into the 744t and see which I liked better. But I am an idiot with (apparently) time to waste!
I hope this helps! I'd love to see a picture of it all in the bag when the time comes.