I have an electric fan from a 90's Volvo on my 350 Buick which works fine. I also have electric fans made by derale on my 455 Buick, which again works fine. I'd recommend that route as it opens up the engine more, and it works great. The only thing I don't like is that if the car is already at operating temp and you want to start it, the fan is drawing current and so is the starter. It's an easy fix to disable the fan initially, but I haven't done it yet.
You can get a wiring kit from Painless for about $65 from Summit, or just buy parts individually and wire it yourself. All you need is a relay (for whatever amperage you need, I used 30A ones) some wire (at least 12ga for the main power and ground, 16ga is ok for the signal wire to the relay) and a temp sender that goes into your intake manifold (that you'll probably need to get from Summit.) If you do it yourself, it'll cost about $25 and may end up looking better. If you go that route and want help with it, I can walk you thru it just email me.
-Romy
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