Bruce,
I too will be following your conversion closely because once I get a couple of issues out with the 300D (new half shaft) and 300SDL (PM on tranny and a new serpentine tensioner assy) , I plan to take my wagon off the road to rehab the a/c. I have to pull the dash to r&r the evaporator for the retrofit back to R-12 so doing the conversion to manual controls (I have two full sets of controls and assd. parts plus a parts car with a complete manual dash) at the same time seems logical.

A question:
The manual system has a siamesed heater core (L & R) with a double valve controlling water flow to the two halves of the core. What is your plan for dealing with the control of water to the single core in the ACC heater? I'm thinking that there's probably an off-the-shelf, cable operated Toyota, Nissan or Ford valve that will to the trick.

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Never a dull moment at Berry Hill Farm.