clutch fan too close for 3 row radiator on 360 engine

Alright, so I got the new clutch installed for the fan and it works great. I have about an inch of clearance between the fan and the 3-core radiator. The problem is it's still running way too hot. I can't even take it for a test drive, I don't get it. It's a stock 360 engine with a new Champion 3 core radiator. I've tried 3 different thermostats and no thermostat.. all run hot. I even checked all thermostats in a pan of boiling water, they all open just fine at the proper temperature. All hoses are new too and it appears I am getting good flow. The system is holding pressure just fine too. I'm out of ideas and I need help.