Steve- Ron has several videos that walk you thru Bullet proof systems. After years of research and talking with Techs they say the delete is great but if you get caught it has to be done properly. They sell a version of the cooler without the delete and it has good reviews. I live in the northeast so below zero weather effects the exterior cooler and my choice of what application is best for me. The biggest problem with the 6.0 early models was ford rushed them into production and pressured international to deliver ahead of schedule. Some of the early blocks were not properly flushed resulting in plugged oil coolers and blown head gaskets, a 10k cab off repair bill from dealers. The blame game ensued and they parted ways while the lawsuits played out.
Flushing the block and and changing the coolant was pretty much task number 1 with these engines just to be sure. A complete flush done correctly is exspensive so your better off doing some reading and doing it yourself if you have not already. Its a half day process and well worth removing the thermostat to speed up the process.
Emissions inspectors look for the removal of the EGR sensor and pedestal in the front the the engine it is rather easy to check and tells them you have removed the EGR cooler
I would not consider a delete myself because the improved designs have larger openings in the cooler and combined with a proper flush eliminate the issue.
Ford dealers will also know if the cooler has been deleted in the event you have to have work done by them and some will refuse to work on it because it is not legal to be on the road in its modified condition (Full Delete)
6.0s got a bad rap because of these issues and there are many bargains to be found if you know how to care for them. Like the 7.3 it will go forever with proper care.