Another transplant question

I have the 225 from the 68 Dart to put in my 68 cuda vert. I see on the "new" motor that the intake man. is tapped on top. I assume this is for a vaccume guage? My cuda doesn't have one but I would like to add one. I presently have the instrument panel out of the car so it would be a good time to add one. Are they available anywhere? What type of tube are they plumbed with?
Thanks
Pike

A vacuum gauge is a neat thing to have; they're VERY inexpensive, are usually plumbed with an 1/8" flexible plastic or rubber hose and are falling- out-of-a-tree easy to install. No car should be without one....
just my opinion, folks...=P~