How close, is to close for rad fans to water pump pulley space

I will be using the flowkooler waterpump with the robert shaw thermostat

The fans are Spal 30100435 - 800 cfm each

The way I have it set up now will only not work and sounds like only compound cooling issue with the shroud so close to the rad, basically sealing the back of the rad. And in this scenario the fans might not be up to the task.
If I install the shroud correctly, there would probably be over 1/2" of space between shroud and rad.

Man, that didn't go as planned. I dig into some options.