That's a tough one '73. Might depend on what front accessory drive system you're running.
Do you have standard V-belts? How many grooves in the pullies?
Of course, it's not really the pullies themselves, as much as it is the particular water pump and how close the snout is to the radiator core. Most setups in an EB don't leave much room for a decent sized electric fan.
The biggest one we carry is a good fan, but needs at least 3" of clearance. And at 2400 cfm, it's just in the area that will work with some, but not all EB engines to stay cool.
How hot is your 347? Fuel injected or carbureted? EFI when tuned properly will often let you get away with less capacity in the cooling sector.
If that fan is in doubt, the Ford Taurus fans are highly sought after at the junkyards for this purpose. But you probably still need that 3" of clearance. Someone here will know for sure though. Plenty of them out here so wait for that confirmation.
This is why a lot of us prefer the Explorer serpentine setup to the standard v-belt or other serp setups. Gives you an additional 1/2" to 3/4" of clearance for bigger fans. And in fact it's got a mean mechanical fan and clutch that many are using instead of an electric.
Good luck. Hope that gets you looking in the right direction.
Paul
