440 Dart cooling fan & shroud

I wouldnt do a flex fan especially without a shroud. I dont think they cool worth a crap. I'll have to see what kind of room I have in the 71 but, I mocked mine up with my stock 2 core 22" rad and a clutch fan and had about 3/4 inch clearance from fan to radiator. I wonder why yours wont fit??? What is that b/w your W/P housing and the block?