I have an 89/244 with 295k miles on it that's my daily driver and with all the miles the suspension clunks and groans and although the engine runs great with excellent gas mileage I'll freshen it up. I'll leave out the suspension work I'm doing and just give my 2 cents on the injectors. You can replace them or do what I'm doing which is cleaning and rebuilding them. The reason for this is I replaced the rubber seals on my factory injectors and was pleasantly surprised with the positive impact. My car idled and accelerated smoother. While they were out I noticed the amount of dirt that had collected in the pintle cap. My thinking is that if fresh seals (real easy to do) made such a positive impact then a clean injector with new screens and seals should be that much better. So even if you don't buy new injectors at least replace the rubber seals. If they've been in for 150k miles they're due. Mine had been in for 275k miles and were hard as rocks. Rebuilding them looks easy enough. I bought a kit and found instructions. Plucked yellow tops from the junkyard (6 actually in case some are bad)and will start the rebuild next week.
Link for cleaning: http://www.rowand.net/shop/tech/DIYFuelInjectorCleaning.htm
Link for rebuild kit: http://www.rjminjectiontech.com/products/inj-kit