I am in the midst of an engine swap- 440. Old set up is being replaced by Mopar aluminum water pump and housing and Bouchillion single groove water pump pulley.

The fan only extends a little into the shroud, whereas before it seemed like it was further in. So how far should the radiator fan extend into the shroud?
Could I have put the fan on backward?
Could the swap to a different water pump/housing and pulley changed the distance?

Thanks!