Hi Dave,
Here's a few threads I found on hbz that might help:
From post 16 of the VH45de questions thread:
For the VH45 I believe VVT was only availlable from 90'-95' (see post 16, 24, and 25 from the VH45de questions thread)
VH45de questions
http://forums.hybridz.org/showthread.php?t=96538&highlight=vh45
See post 7 of this thread which compares the US VH41 to the US VH45:
VH41/45 external differences
http://forums.hybridz.org/showthread.php?t=126375&highlight=vh45+chain