For a manual trans, you'll need the Mazworx adapter kit and a Z32 trans. Otherwise, check out any of the S13/S14 swaps, and keep in mind that the S12 bay is quite a bit shorter.
Edit:
OH! And make sure the VH is the model with metal chain guides and not the plastic ones, it'll be a later model with the good ones. I don't recall the exact years, and you can upgrade them yourself, but newer is always better.