Hello Rob,

I took a look at the jenvey plenum, and it does look like a good piece.
You are correct that it will require some work - machining and or welding
to get it to work with a CVH. You can certainly modify an existing CVH manifold (lower portion) to work with the plenum. Bell mouths would probably be best? inside the plenum.

Looks like a neat project if you get one.
Be interesting to do a before and after test with a regular manifold and a much modified one with the jenvey plenum up top.