That's my "driving" setup, with full manifold vacuum (from the tee in the choke pull-off hose, which normally feeds the diverter valve) to the vacuum advance can; for "show", the cap comes off the end of the original steel line, the original short striped hose to the vacuum advance goes back on, the long piece of hose comes off, and the (plugged) diverter valve hose goes back on the choke pull-off tee.
The factory setup used "ported" vacuum to the distributor vacuum advance as an emissions "band-aid" to retard idle spark timing to increase idle exhaust gas temperature to improve the "afterburn" in the exhaust manifolds with A.I.R., but it also caused idle instability, idle and traffic cooling issues, and poor throttle response. Doesn't take much to fix it.