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I backdated the heat on my 83 SC several years ago. The left side piece did need modification to fit around the distributor. I'm sure you can find one that will not need to be modded, I have seen them but can't recall where.
As far as engine cooling, I have not noticed any difference in that with or without the mod.
The heat and defrost are still quite adequate but at idle it is lower than if you have the fan installed. I personally am very happy with the mod and have plenty of heat in the cabin even on cold Massachusetts days/evenings.
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Lou
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