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The original radiators are good at their job, just rest of system isnt. Heavier copper and brass units may not work as well despite their advantages. New alloy cores are pretty reasonable price. as are the plastic tanks
Definitly get a second temp gauge, all the way up to red isnt "overheating". Used to be plenty of info around on this. The standard gauge isnt linear in its reading
The new engine will be a bit tight and likely to heat up a little Id have thought.