Robert, if you can find an electric fan that moves 4400 CFM, it is an industrial application powered by a 2hp electric motor. The highest output fan motor that I have found is a Spal Racing Only application that moves 3200 CFM at 0" static, or about 2300 cfm at the 1.4" static pressure drop across a conventional radiator core.
I would run a mechanical fan in a truck if you are pulling anything. Keep in mind the tip clearance. While Jerry is right about fan to shroud engagement to a point, tip clearance and fan to core distance have a bigger impact on installation efficiency. while the half blade engagement is a good rule of thumb, 5% diameter tip clearance and minimum of 1/2 fan hub diameter blade to core distance are the better rules of thumb. You are looking to get minimum of 11fpm velocity across most of the core, not just a donut where the fan blades are.
Another thing to note, the factory coolant switch point for the fan was 220F, and 230F on the later Camaro's and Firebirds.
