On a somewhat related note, I used a V8 torque converter when I 4L80E swapped my V6 truck as that's what came with my junkyard 4L80E. (Donor truck was a '97 C3500 with a 350.) It works just fine, but I feel like a slightly looser converter would be beneficial. After the swap I can't really get the truck to do a burnout on dry pavement, it would do so almost effortlessly with the 60E and V6 converter.
Makes sense as the v6 converter would rev more before "dropping the clutch". Of course, to do an apples to apples comparison you'd have had to use the v8 converter on a 60e, as the 80e takes more power (which you are already lacking) to turn.