There was a member here whose username is 'indestruktable' who was trying to sell a good running, cosmetically challenged 740 TD sedan for $1000 in OH about a year ago:
http://d24t.com/showthread.php?t=1049
You might want to try contacting him to see if he still has it, doesn't look like it ever sold to anyone on here at least.
By the time you find a motor and pay for it plus shipping, you might be ahead financially just buying a complete parts car that is closer to you, assuming you can find one... that way you also get a lot of other bits that might be useful plus you know how the thing runs before you start.