Don't believe them your engine is in danger if it's running at 210 deg's. Older enginge are not designed to run those high temp. Newer engine run that high because they were/are designed to run that hot & have the ECM control the fuel flow to help cool them down when they get to hot. Thats why a new car will smell as if there some gas coming from the exhaust when they get to hot. , also the timming get retarded . But haveing an old bird run at 210 is way to hard on them. They were designed to run at 185-190 only. If it' didn't go down when your running in traffic you have a PROBLEM. Start by checking your timming & then adjust your carb. You need the extra fuel at idle to help keep it cool. Also to advance on the timming will make it run hot. To little fuel will make it run hot. Your 400 should be able to idle all day long at 185 with a 2 row rad. Even in Hot weather it should not go above 190. I'd look at the items I mentioned first before you go spending any big money on items you don't need.
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