clutch fan too close for 3 row radiator on 360 engine

I have a new heater core, I'm doubting that would make a difference though, the lower hose is not collapsing, I have lots of fan, no shroud though. I know it's really getting hot cause it's sizzling, has really high pressure and I'm using the same gauge and sensor from the 273 this engine replaces. It's not just getting warm, it's got the gauge all the way to hot just before it boils over. It does not come down when driving down the road either. WTF?