I do 55-57Ft/lbs for the injector halves and installing them into the prechambers. No issues so far. I have rebuilt injectors for several people here on this forum and no complaints. Don't torque them too much or you can damage the injector's internals.

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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