Well I finally ordered the CAA kit which fits up to 72 and started the installation in my 74 heat only car. Thought I would post here what I have done in case someone else wants to do it.
They start by having you install the fan switch. On my plastic dash control assembly I mounted the new switch. I had to use a dremel tool to shave some areas of the plastic assy to get it to fit. See pictures.
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