Can I put fuel injector cleaner in a 1952 ford F-1 truck ?? Yes you read right 1952
Most labeled as fuel injector cleaners are unlikely to be much different that those labeled fuel system cleaner. However I would only use Techron Or SeaFoam.
But, if you have been using pump gas with ethanol, you may need a carburetor rebuild and any rubber fuel lines replaced.
I assume you have a flathead V8, keep it running and happy motoring.