Nice find!
That is not a complete assembly, though. It is either missing the condenser and/or the evaporator case. That looks like the evaporator core – but it needs some kind of housing to go into.
By the way, I have worked on a lot of those “add-on” A/C cars before. They do not look right Also, they are more difficult to perform a lot of under hood or under dash repairs.
Also, they do not work as well as a factory A/C system does (but better than nuttin’)
I cannot recommend installing "that type" of A/C to a non-A/C car – but will support you, if you do.
That kit is way over price (IMO) – but if you were considering using it, I would want pictures of all parts of the system, verified to be there – first (using the parts list, as pictured).
I think a person could find all of the parts, used, from a fellow member and/or salvage for a lot less $.
The next step – which might be the hardest, is to modify the firewall (add new holes and subtract old holes).
BudW