Need pics of stock '64 225 carb/kickdown linkage.

Thank you very much for the information. Are those diagrams from the factory manual?

You're welcome. Yes, they are.

Are the linkages attainable in the used market

The rod-type setup (or parts) will be easier to get hold of than the cable-type setup (or parts). I might have most or all of a rod-type setup stashed in my garage; give me a few days to check and see.

I also need to see how this AC system was originally set up on this car. It has a "Frigidaire" sticker on the inner back window.

Check again. Are you sure it doesn't say "AirTemp" like one of these:

MD4175.jpg

MD4174.jpg

AirTemp was Chrysler Corp's air conditioning division. Frigidaire was GM's.

Info on the setup of the AirTemp system is in the factory service manual, which you really should have for your car.

I have a couple of airboxes but don't know exactly what is missing from the AC system. You can see the dryer and what I think is the expansion valve mounted on the inner fender well.

Errrrr...tilt! You've made me look closer at your pic. That's not a '64 setup you have, it's (parts of) a '65-'66 type factory A/C setup. That horizontal cylinder is the filter-dryer (useless now since it's been open to the air—will have to be either custom-rebuilt or replaced with a different type, since this horizontal style is NLA) but that dingus back by the firewall isn't the expansion valve, it's the heater control valve present only on '65-up A-bodies with factory A/C.

What's behind that rectangular patch of fluffy stuff on the firewall there? It's hiding what would be (on a '65-'66 factory A/C car) the blower motor, the heater in- and out-pipes, and the A/C evaporator in- and out-pipes, as well as the area where the expansion valve would be.

You sure your '64 is a '64? If so, it's not 100% '64 any more; someone made an attempt at swapping in '65-'66 factory air. I did that swap into a '65 not originally equipped with air, and it was a GIANT hassle I would never recommend doing. Too much stuff is different, too much cutting and reworking and fiddlefutzing required.