I always use a steel line (stainless) from the carburetor to the vacuum advance mechanism on the carburetor. Even though this line is well-above any of the hottest parts of the engine. Steel is safer, and it is easier to safely route around the top of the valve cover.
However, I am confused (amused?) by all the dire warnings about rubber hoses (of any length) being "sucked shut". How many of us have long-lengths of rubber hoses going from the intake manifold to a vacuum wiper-motor (this is the same amount of vacuum as in the advance line - 19"-21" of vacuum)? red58 and crenwelge (and others who posted that rubber would be OK) are, of course, correct.
Steel does last longer, and stainless steel would even last longerer.
