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My 3GM is raw water cooled and 30 years old. I think I like the raw water cooled. Very simple and fewer parts to break. If I had to repower, I would install the same if it were available- 30 years or more use not bad.

The zincs on mine were corroded away and I had real trouble getting the zinc plug out of the block (2 GM will have one in the block and one in the head). You remove the zinc plug and then unscrew the zinc (or what is left of the zinc). I had to use a small propane torch to heat the plug to get it off. And even then I must have had 400 ftxlb force to get the plug to unscrew.
 
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