So, my question is can anybody tell me how much room I need to allow for a blower drive (Front of the block to front of the lower pulley)?. I'm figuring 2 pulleys behind the blower drive just to be safe. If I go with 1 belt at least measuring for 2 I'll know I have room. I have about 4" room in this picture but the block is already set back an inch. I've got the rack about as far forward as I can go. I'm making my own firewall, so my only setback limitation is the blower against the windshield glass