It's possible it's running between the manifold and the radiator...but the last time I took a good look at it, it appeared it was running up between the connections of the intake and exhaust manifolds. It's also possible it could have been rerouted when the vehicle was redone in the early 80s, long before I got it, though I don't know why anyone would reroute it that way, unless they were idjits...
If I were to have it rerouted, I would take it up across the firewall, around and then into the carb.