Fan spacer question

i want to get going on my 70 dart to finish it up ....its been a while since i have done anything with it .......last time i was working with this car i ran into an issue that im not sure about.

the radiator i want to use in this car is a pretty hefty HD unit and with the radiator in the car there is no room for the fan spacer.

so the question is: can i bolt the fan directly to the pulley like in the pic or do i need a spacer. Also, how far should the fan be from tne radiator ?

i dont have a shroud if that makes a difference.....and this is a 440 so i dont have much room in there.