drop in electric fan that wont break the bank ?

[full foot notch]

so my truck has a 400sbc with dart iron eagle heads and a few other goodies, and the previous owner for some reason put a direct drive nylon fan onto the motor, well being here in florida it can get warm some days, and when I took it for a drive recently it would fluctuate between 160 and 180 depending on if I was driving or sitting in traffic.

what I would like to do is buy a drop in setup that doesn't require cutting here and screwing there (yeah ive read on the Taurus and Lincoln fans that people use here), but all the ones im seeing are in the 400 and up range, 800-900 if its a Be Cool radiator and fan combo. I know it will require an external fan harness for power and that's ok.

the few questions I have are, is it better to go with one big fan or two small fans. if I only need one does it need to cover the whole size of the radiator or just a fan that matches the current nylon direct drive fan diameter. and does it require a shroud as removing the mechanical fan shroud would give a lot more room in the engine compartment.