A perl package's name comes from the "package XYZ" declaration. If you change this, and change the directory name, and change every use of the Infoblox:: namespace... you have a good chance of it all working.

# install Infoblox version 7 first,
# then in the perl lib directory where it installed:
find Infoblox -print0 | xargs -0 \
   sed -i -e 's/Infoblox::/Infoblox7::/g'
mv Infoblox Infoblox7
[download]

If there is also a Infoblox.pm, then run sed on it too.

sed -i -e 's/package Infoblox/package Infoblox7/g' \
       -e 's/Infoblox::/Infoblox7/g' \
       Infoblox.pm
mv Infoblox.pm Infoblox7.pm
[download]

Then, give it a review for other uses of the word Infoblox to look for any others that might need to change:

grep -C 4 -R 'Infoblox[^7]' Infoblox7.pm Infoblox7 | less
[download]

Then... give it a try. If it works, then you can install the new Infoblox alongside. (and maybe decide to rename it too, since they vendor wasn't helpful enough to version their module)

If it doesn't work, then fall back to the other lib directory strategies proposed here.