I'm not trying to be a pimp or anything but if anyone needs a set of injectors rebuilt, PM me. The link in my signature explains in detail, with video, how to rebuild injectors but if you are not up to the task, I am willing to help. I have been thinking about collecting a few sets of cores and rebuilding them to sell as soon as new nozzles came on the market.

As far as needing new injector nozzles goes, most of the time it is not 100% necessary. If your car has 250K on it and the injectors are still original, it is nice to have them pop tested. Even marginal injectors can run well in the 61x series engines but a new, balanced, set of injectors can help smooth idle and increase performance a little.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge