Sorry for the delay in response, just saw this topic.
no one currently makes a kit, mounts or anything else for the VH into a 300 chassis. There have been a few done (check out
www.v8nissans.com) and can be found. That site seems to have the most guys doing it. Username SuperHatch is very familiar with this swap and would be a good person to contact.
We am in the process of making some mounts for the VH into the 300zx and also other items such as manifolds to fit with the stock hood.
Hope that helps. Let me know if you have any questions.