In a pretty thorough search for info on how to drain and fill the coolant system it seem's that there is no reasonable easy way to do it. The best solution's found were from:

XmtbX00 who was going to drain the radiator then add water (distilled of course) until it ran clear. Next he would fill the radiator with pure coolant and get about 40/60 ratio of coolant which is probably good enough for a temperate climate. If not he was going to drain the radiator again and add some undetermined ratio of (which I calculated to be 17/83 ratio or 1/6) if the capacity of the radiator is about 1/3 that of the total system.

I will probably do this tomorrow unless diassuaded but it seems to be a good way of doing it. Besides, a memeber max had stated you must remove the alternator to get at the left engine block bank, which I would rather not do. Today I tried getting at those damn plugs and it ain't fun.