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if it's leaking where the tube meets the tank it could be resoldered. A good radiator shop could also recore it with an aluminum core with more rows.
The reason I mention having it recored and repaired is often times the replacement radiators just don't fit properly and require modification.
Another option would be an all aluminum unit from a reputable company such as Ron Davis, they are a little pricey but very high quality.
here's a link to that website.