I agree with the others, look for a a engine to swap at the same time. I was told the same thing in my transit and swapped it anyway. Swapped the VH9 with a V730 behind a 6v71 (fresh). Gained 5 MPH but took 25 minutes on a down hill slope to get there.
You'll have to swap the engine bell housing or modify the existing one to have a fluid return for the V730 so the kit should contain:
modified bell housing
input shaft
cooler
tranny support.
Thanks,
Jack