Upgrade mechanical fan vs installing electric fan

You might do like my 1985 M-B diesel. It has a clutch fan, plus a pusher electric fan. The electric only turns on from AC refrigerant temperature at the filter/drier. I put one on my 1965 Dart. My 1964 Valiant already had a M-B pusher fan when bought, with no mechanical fan. It isn't sufficient to cool the radiator itself. Even worse, some gomer wired it directly to the ignition switch (no relay), plus ran the wires thru bare holes in the firewall w/ sharp edges (no grommets). I am keeping it to help the AC.