fan spacer question

IMO the closer the better, I think there is a minimum spec, but I have mine (I have a small block) should be the same though for you, approx 1 inch away from the radiator, now most here will tell you to get a shroud, I do not have a shroud, and I have a flex fan now, but before I had tried an electric fan but no matter what I did the water pump would hit the fan motor, so I had to install the electric fan off center of the radiator, and then my car over heated, so I went back to a flex fan, and a 2 inch spacer now it takes like 20 minutes for my engine to warm up, soooo I went and bought a clutch type fan and hopefully that will help it warm up faster. haven't installed that yet.