Highest flowing CFM electric fan that ACTUALLY fits?

There's nothing as annoying as constantly watching the temperature gauge....
Add to that I'm adding a lot more horsepower and air conditioning and I'm gonna need more air flow.

I tried the big Ford 2 speed fan that a lot here use, but no matter how much I offset it to the side I could not get it to clear the water pump.

So, what is the highest CFM flowing electric fan that ACTUALLY fits?

Spare no cost...lol
Thanks

Jeff
Need more info on your current set up?
Does it heat up in traffic or cruz speed?
May not be a fan issue