these mighty engines can handle a little fluid in the cylinders so long as it's low rpm and no load....
you may have survived, and that would be sweet if you did... here is how I can suggest such:
at the RPMs and load you were likely pushing, there is more pressure from the exhaust leaking into the cooling system than coolant leaking into the intake... that is very true at high RPM and high load, but NOT true at lower RPM and lower load, where it sucks into the intake just fine.... chances are you sipped a bit, but it's unlikely you gulped enough to bend rods, break pistons ect...
let's hope, huh?
cab doesn't have to come up for EGR coolers, though it's much easier if it does... in time alone, it's about a push, with cab on having a slight edge depending on the competency of the mechanic...
this is a simple equation: If the cab comes up, by all means do everything at once and your truck will near the reliability of a 7.3- that includes HG's, studs, up pipes and down pipes, machined heads and camshaft replacement with a sensible one, and rockers... this doesn't include pistons themselves, though that is another item that should be considered if the engine has to be plucked... the stock ones with their goofy lips are crap compared to the international/navstar ones- and especially if you have them coated. all new boots and seals, and get a good long and careful look at the turboset.
these things are simple to do on a rolling chassis, and SUCK to do cab on, if not impossible.
do yourself another favor: tune and delete... dump the crap that kills your investment. people can moan about pollutants all they want, but they can kiss my arse when it's your investment, and besides (i mean this), i'd put a reasonably tuned and deleted rig against a stock one any day over the span of a tank of fuel- this era of rig "doesn't pollute" most the time, then it pollutes it's arse off in one fell swoop called the regeneration process. go figure, right?