Indy heads single water crossover /single plane manifold.

Not sure of your experiences with electric fans but I have always run one and never had an issue once with 2 different engines and the second one has a pile of power. I think this applies to most people's issues on cars......they hope that a 19.95 fan will work in place of the 250 dollar one they really actually needed.

yep, my rule of thumb is if the fan motor isn’t drawing more than 20 amps, it won’t cool your car. Not a strong enough motor.
I like Derale stuff, but Spal is supposedly OK too