There is an electric fan that fits with the thick radiator with the V8, a thread here explains it. It's the Black Magic 190 I think, I have one myself to install I bought with the new radiator. It's a tight fit, but it goes in without major cutting.
You need some anti-freeze to resist corrosion, and 1/4 to 1/3 is plenty to do that. A 50/50 mix has a measurable reduction in efficiency, making the running temps higher. So as much as you read on all anti-freeze containers, that's advertising in their favor to make you buy more of their product. You only need what you need for your location. If you never see -40 degrees(or -34), why run half anti-freeze? That just cost you more money, lasts no longer, and raises the coolant temps, versus less anti-freeze.
A warning story; I've had one problem with coolant, about ten years ago, with my 99 work truck. I had the e-fan not work after washing the engine. I discovered it the next day(high idle), and shut it down, fixed the tripped circuit breaker(marine), and it ran fine then. The washing tripped the circuit breaker which should have not been affected. The loss of maybe half gallon of coolant dropped my anti-freeze ratio to more like 10-15 degrees, found in Winter when the radiator froze(4 degrees outside). That was my fault, I never got around to correcting the coolant mix. The T-stat opened fully both times and luckily it hurt nothing. So having an electric fan has more risk, more required attention and care. You have to keep up with the anti-freeze ratio, really well if you alter it close to your Winter limits.
