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Are you sure about that model number? I'm coming up empty on specs for that number
Ok, this model was discontinued 40 years ago. There are no manuals or wiring diagrams available. If you're sure it's in working order maybe we can figure this out if you can give me some pictures of the wiring connections. You can post pics here by clicking on ADD FILES next to the SEND button
The best I can make out from your description would be to connect your line in black to red and white to the whites. It sounds like there are 3 terminals on the limit a line in and 1 out to the fan the other out to the transformer. Also since this is a used unit and the only leads not connected in the junction box are red & white which would indicate they were originally tied to the line in. Your thermostat leads should connect in series with the transformer lead not directly connected to the gas valve.