Finding one to fit will be easier with the later A body.
I would go aluminum for sure , cross flow is a plus , and which ever fan you use , a shroud is your friend.
I had the Chevrolet SSR electric on mine and it worked well.......it has the shroud built in , but you have to be creative in mounting it.
I am now adding to the mess on the front of the motor , so it is now too thick and I will be looking at other options.