Matt,
Go to CJPonyparts and type in clutch fan. You'll see a 6 blade fan and a non-thermal clutch. Those should work fine. You don't need the fan but I noticed an increasing cooling capacity when I went 6 blade a few years ago.
As a side note, I went with an electric fan on my 72 and I'm very happy with the purchase. I swapped over after I hit my wrist/hand/knuckle the 3rd time and vowed to never do that again. Electric fans cost more and will likely require you to upgrade your alternator but I like my fingers.
Electric fans don't rob engine HP, allow your engine to heat to operating temp faster, only run when the temp is above your desired setting and won't crop your digits. The alternator will push more power which equals some HP but it's not even close that massive metal fan spinning at all times.
KR