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I say if you don't see any oil sheen on it, keep on flushing cause it's dirty as sin!

That color is pretty well expected, BUT, it sure looks to have an oily consistency to it. I would go ahead and drain both radiator and block, verify that the oil on the dipstick looks fine and no milky buildup on the underside of the 710 cap, then do another flush to see if it looks better.