Looks like I'll have a weekend project, then.

I have worked with other types of injectors that use shims behind the spring to adjust pop pressure; is that the case here? How would I go about actually adjusting the pop pressure if I find one is too far off?

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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