Clutch fan radiator clearance worries

Car was running warm last summer so I bought a new thermal clutch and fan. Went to put it on yesterday and only had 1/4" clearance between front of clutch and radiator. Is it supposed to be this close? Is this too close or does it need to be that close, or did I get the wrong clutch? It's a hayden 2474, in a 68' sport sat with a 440. Thanks