7 1/4 to 8 1/4..... easy?

All 4 u-bolts are there and intact, it's in pretty good condition, gear oil was clean with no shavings, almost look's freshly rebuilt.... DAMN if i only had that drive shaft..... how can you tell if your tranny is a 904 or a 727, i was told by the previous owner that he "thinks" it's a 727 but he's not a very reliable source of information.......
If i do need to get it cut there's a place that my shop has an account with called "Ed Moore Drivelines" and he seems to know his stuff....