Thanks i bought that resistor, but from ebay instead. I hope it dissipates the heat better. Also, the switch to the heater is:
-OFF
-HIGH
-LOW

And theres no heat conrol, but i guess thats because it gets its warmth from the radiator?

Thanks a lot guys!

Chevrolet 3100
Year: 1951
engine: inline 6 217CI
Transmission: Manual 3-Speed.
12Volt.