Overdrive options

GVOD.

4.56 gears and I run about 2500@60mph.

I've had the GVOD for 15 years or so. It works flawlessly and would also work with your 727 which is a nice bonus.
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.