mine had one but leaked so i took it off and just run hose down side of radiator as old machines did years ago, seams to work ok. But I check fluid often, at least twice a year and add as necessary, am sure if i had a recovery tank I would never have to add any fluid.
While working on radiator i would install a new 14psi cap, having a radiator cap in good working order makes a difference as a weak cap will let fluid out when pressure builds up.
My 84' with a 258 didn't come with one from the factory, only had a drain hose that ran down along the side of the radiator and emptied onto the driveway for all your household pets to lap up. I'll be adding one when the body gets back onto the frame though.
My washer reservoir leaked, also. The washer reservoir from a mid-80's Nissan Pathfinder fits the spot above the ignition module, almost too perfectly. Hey, it's what I had at hand.
You could have been an engineer with AMC,
Although I am a stickler for OEM with most things, I absolutely love finding stuff from other makes that fits and or functions better than stock. I feel sorry for whoever ends up with with my crap, I'm not leaving the decoder ring.
My 85 had one at some point, but was removed by the PO. Replacing it was one of the first things I did to it.
Keep in mind that the rad caps are different for expansion and non expansion systems.
"The arrogance of officialdom should be tempered and controlled, and assistance to foreign hands should be curtailed, lest Rome fall."
- Cicero -