I would consider the Lincoln Mark VIII fan. Very powerful, somewhat slim and inexpensive. I will be using one on my project-the shroud is almost exactly the same size as original. Got one at the Pick n Pull for $30. Moving lots of air takes lots of current. I think this fan draws 30A at full speed. I can measure mine for size if interested.
https://www.fordmuscle.com/archives/2006/10/Mark8Fan/
https://www.hotrod.com/articles/ccrp-1111-electric-radiator-fans/
Also the controller. This is a well regarded, variable speed controller so you don't have full speed when you don't need it.
constant temperature controllers