Lincoln MKVIII fan flows ~5,000 cfm, but requires 40A! Overkill for these cars, but if you need something that moves a lot of air, then it's an excellent choice and not much aftermarket out there that compares.
I have a Ford EV-1 (Ranger Electric Vehicle, late 90's) that probably flows about the same. I was going to use it on the Chevelle...
Point is, there is many oem offerings that work great and IMO aftermarket electric fans are overpriced and underperforming.
Oh yeah, a puller fan is much more effective than a pusher and the key is a good shroud! and of course a good radiator that is functioning properly. Increasing the cap (system)'s psi rating and you raise the boiling point, fwiw. So, basically, the fan is an important part of the system, but not the only component to focus on.