Tire valves contain rubber (not designed for contact with solvents) and gasoline will deteriorate the rubber over time. The gasoline container may have dissolved rubber and particles in in that could clog carburetors and the improperly designed vent may eventually leak.
The C174 was sold as an Allis Chalmers 5015 and as Simplicity 9518. The Allis p/n is 2100732-3. If you do some web searching with the Allis or Simplicity models you will find the radiator. A and I products sells the upper and lower hoses.