Thanks for all your advice. Since I want to keep it as stock as possible & have no need for performance, I'm a driver, not a racer, I'm going to take a chance on a quality built Thermoquad. Especially since that's the intake I have.
Swaping a bad 400 with a 440 in my 73 Monaco 2dr. In 72 they used a Holley 4 barrel. In 73 its a Thermoquad. Should I go with the factory type or Holley? What issues will I come up with trying to keep the correct vacuum lines? Anything else? I don't know much about the Thermoquad.