Thanks Captain Obvious!... I'm glad I took the extra time to rod this thing out and suck out all the goop as it will undoubtedly flush out much faster. I really did need to run mechanics wire around all the water jackets that I could to break up the crap and suck out what I could with a 5/16 Hardline as a vacuum extension.
I have a feeling this thing would have had a major issue with the bores running hot for a long time till all this crap loosened up and flushed out.... I got the jacket drains broken free so I can at least use them in the future.