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I believe the L78's came with with 4 CORE & 772 CLUTCH FAN as std equip but i am not 100% sure of that.

But even if the 4 core was not std equip on the L78 then it was definately an opt so if you dont have the build sheet for your car you could go with either the 3 or 4 core in that case .

Scott
 

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I do have the build sheet it says BJ in the rad. box. The car has a replacement

I have a Kansas built L78 4 speed, 410 posi. The build sheet shows BO in the radiator box, which is a 3 row.

Is your car an automatic? What axle ratio?
 
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