after you replace the injector O rings be sure to replace the fuel feed and return O rings
there is only 1 in each
and vent there on the manifold
you use like a dental pick to fish them out
and the main feed line is the most likely
to fail and cause a fire
you might want to all so use paper towels to plug up holes
that way no lent gets in the engine that can plug up oil passages
they also work great with carb cleaner sprayed on them
to clean up intake ports and so on with long handled needle
nose the 2 foot kind
carb cleaner from Wal-Mart works great 2 bucks a can to
and while you have it apart check the back of throttle body
for carbon build up

I checked my coolant but pumping with a hand pump out of the reservoir into a small jar. The coolant has plenty of particles floating around. There was also a bit of mud underneath the radiator cap. Thats what prompted me do pump some out into a jar to have a better look. pic: https://i.imgur.com/ljuTqvz.jpg
I was going to just refill the radiator when done with the gasket job, but now I think I should do a more of a flush. Anyone recommend a way to flush the system out? I will be using havoline dexcool to refill.

I plan on using the LIM end seals with just the RTV at the ends to seal between the two gaskets.

you can try the old prestone back flush they sell at walmart for 4 dollars
I would just get extra 6 inch of heater hose and a few clamps
so you can put in line on heater hose then remove it when your done
in order to total drain block
the knock sensors have to come out
so the prestone trick would be much easy