Fan shroud.... taking up space....?? What else you going to do there anyway? Keep a cooler full of beer?
Going back to stock should be VERY inexpensive if you source a used fan, shroud and clutch (rebuild the clutch yourself for about $30). From the sound of it it'll be cheaper than fixing what you have and will be cheaper than a lightweight, low drag mechanical setup.
The fan needs to be driven based on coolant temp. It should turn on at around 190?F. It needs to be controlled with a relay off of the alternator output too. Do NOT rely on any stock wiring to control the fan or power it! Don't forget to add a proper size fuse to the power supply line as close to the source as possible.
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