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I've used Ujoints from zerked Lakewood HD Ujoints to modern sealed units. For the most part, the modern sealed units last for hundreds of thousands of miles and 10+ years. A zerked fitting has the downside of people pumping too much grease into it (or the wrong kind/base) and blowing the seals, etc. Plus there's the opportunity to put it in backwards so the zerk tapped hole is in tension rather than compression and on hard launches the Ujoint spider can crack.
I'd just put in a modern sealed U-joint. It should last longer than you on your classic 120-130 series car.
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