A 38-yar-old 'can of air' may be empty by now, and in any case, most use a unique connecting fitting or hose so be sure you get everything. Unless its just for show. As far as aftermarket tire inflators, first look carefully at the label on the back. Some are pressurized with PROPANE! In a hot front or rear trunk, this is a legal hand grenade and in fact, some have detonated under high altitude & long runs. One Nor-Cal member had his Pantera's decklid blown open up in the mountains, shearing the latch & putting two big dents in the steel.
If your present inflator- in any car- says DANGER-EXTREMELY FLAMMABLE, throw it away right now!
In addition, people who have used these bombs on tires, then gone to a repair shop to have a puncture fixed right, at at risk. A So-Cal shop had a BMW (I think) up on a rack and used a rasp to enlarge a puncture hole for a plug; the tire was a steel belted. A spark detonated the tire, killed the repairman, wrecked the shop and damaged two cars outside. Even deflated, they are like an "empty" fuel tank. BEWARE!