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Simon,
I'm not sure exactly what a WEBASTO gas heater is? Is that the heater Porsche had as an option in the late '60s?
I had a fraternity bro that owned a '67 911S with a gas heater. It fit where the A/C evaporator is located on your '78. I intalled a VW gas heater in an '66 MG I owned, my first car. So have some limited knowledge. They don't use too much fuel, and work very well.
Jim
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