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I pulled a set from an accident-damaged 84 in the Yard with 170k mi showing and sent them into a specialist shop. They cleaned and tested them. Before cleaning they reported a fairly big variation in spray pattern and flow capacity, and said one was leaking slightly. Of course after their cleaning process, everything was reported near perfect.
In the course of other engine work, I replaced the original injectors in our 83 (155k mi) with the refurbished ones. Due to all the other work done at the time, it can't be said there was an improvement which could be singled out and credited to the fresh injectors. The car's pinging was gone (but I also cleaned up the head). The hesitation in acceleration was much reduced (but I also replaced the wiring harness, the ignition cables, and the spark plugs). Idle was a bit smoother (but I adjusted valve clearances). Fuel economy was unchanged - and I track that religiously.
What the $24 (per injector) has bought me is some peace of mind that they are performing up to spec - but partially offset by the nagging thought that I may not have needed to do this at all.
Conclusion? if your engine is running reasonably well, and your plugs look uniform and don't indicate a rich or lean condition on one or two cylinders, I would leave the injectors be. Maybe add a bottle of Techron to the tank a few times a year.
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Bob (son's 81-244GL B21F, dtr's 83-244DL B23F, 'my' 94-944 B230FD; plus grocery-getter Dodge minivan, hobbycar MGB, and numerous old motorcycles)
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