Justin,
I concur with David and Peter. I don't believe an aluminium radiator is needed. A modern re-core of your existing rad and puller fans (or one big one) mounted on the rear of the radiator should be sufficient.
I did away with the original fan(s) and cowl - not sure if the 408 has two fans like the later V8s. The inefficiency of that design was pointed out to me when I was trying to improve the cooling on my 411 after adding air conditioning.
After a rad re-core and adding a puller fan (or two), without air conditioning (so no condenser in front of the rad) you may get away with leaving the original cowl and fans in place if you want to maintain the original look.
Regards,
Kevin
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