I was thinking the same thing when I took out the rad on my 90 to clean it. Surprisingly it was in good shape as the original owner kept up with the maintenance on the cooling system and didn't use the car much. I was doing a samco hose kit and my oil cooler hose r&r project and decided it would be a good time to clean the cooling stack also.
Not to make work for you but here is a link that I found to be a very useful alteration/addition if you use your Z alot.
http://www.zr1netregistry.com/ZR1_radiatorscreen.htm
I average about 5K a yr and every week I get to see what junk would have gotten into my cooling stack.
Oh yea, thanks for the mention of Fluidyne....I completely forgot them in my thinking about where I will get my replacement radiator when the time comes.
Tom