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Tee a heat riser pipe from exhaust manifold heat shield, or from behind the radiator into the intake infront of the filter. A butterfly valve on either the hot or cold side can be used to control temps. Carbed cars used a bi-metal thermostat controled, vaccum operated valve. But if you want you can use a TOGGLE SWITCH to control an electric solenoid to open & control the valve.
You could use the exhaust heat as the continuous heat & the electric heater for instaneous heat.
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