I'm not sure what all would be involved to bring over just a block. I have never tried it that way.
Instead we turned vb into a postnuke module so that I could have my left side postnuke blocks show up on my vb pages. It was quite a job to do this without touching the vb code itself, other than a few include statements, and zero changes whatsoever to postnuke.
This module will be released late this summer, along with many others such as photopost module, and oscommerce.
To see it in action
www.annointed.net
test user maytest11
password newbie
Please respect that this is a live site though.