what fan should I use?

[Mopar92]

I am building a 360 Duster 4 speed now. I am trying to decide what fan and radiator I should use. This is the first car I have done that did not already have everything. I plan on just using a mechanical fan. My 70' Dart is mechanical only and I have never had any cooling issues. I don't recall what radiator, but it is a Mopar unit. I am not opposed to an aluminum radiator. I just don't think the slant 6 is going to cut it. Thanks

 

[1968FormulaS340]

Mopar sells a nice clutch fan.

 

[Mopar92]

I've had good luck with them as replacements. What size and blade count do you all like?