Using A Different Fan On A Slant Six

New guy here with a question about changing a fan on a slant six.

I'm building a 60 Savoy with a slant six in it and would like to make the most of cooling. The stock 4 blade seems like it would work just fine. My concern is that high summer temps during parades would be a problem.

Would a 7 blade fan with clutch out of an AC equipped car make a difference in cooling? Is it even a possible upgrade?

This car is not going to be a daily driver. It is a clone of what we ran on the Chicago PD in 1960. That said, it will be driven wherever it goes. That includes Washington DC, NYC, and numerous local events that range from 10-250 miles.

Any help is appreciated.