Radiator and fan blade...
That fan blade is not a Chevy item as far as I know. The 68 BB had a short water pump and depending on HP rating or options like A/C you could have a fixed 4 blade or a clutch fan with 5 blades. The 4 blade fan would require a spacer to position it properly inside the shroud.
This info is well presented on the CRG page I sent you. Of course, you can adapt to fit your needs...more horsepower usually increases the need for proper cooling system components.
-wilma
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