Overdrive options

Does the driveshaft angle become a problem w/ the gearvenders on a 727 in a 68 fish ? Looks like the d.s. would be extremely short > Wish I could afford one.
I know it's not everyone's first choice but I have a 999/GV setup in my 67 Notch and it performs flawlessly. 3:73-1 SG with 28" tall tires = 2400 RPM @ 70 MPH.
I like it!