I didn't notice any tamper proof seal on the ALDA. It is just a bolt threaded onto a screw. If there was some kind of paint markings, they are long gone. The screw is pretty stiff to turn, though.

I like your idea about the scotch metering. I have a feeling I would pass out before I could finish the job, though.

My EGR stuff has been removed from the valve cover. I am waiting to receive an EGR delete kit so I can remove the silly little tubes and the rest of the junk over there. It beats me if the EGR is stuck open or closed. I imagine it is closed.

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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