CFM electric fan ratings needed for 1st gens.

All I'm looking for is the amount of cfm that would be needed for my 2001 3.4L prerunner. I've got the stock radiator that is 22 and 5/8" top to bottom. I will be experimenting with a couple options and want an idea of how much cfm will be required and I'm unsure what stock clutch fans pull..

Looking at electric fans on eBay and want to try it out. I know it might sound like a bad idea, being they probly will fail on me quicker than name brands. But for around $100, if it works, it'll be worth it than paying around $400 for a good flex a lite kit! So I'll try it out and let ya know, soon as I figure out what route to go and what cfms I need.. so throw me some numbers so I have an idea.