Keith black small block found/info

replicaracer43 said
It's nothing but a production manifold drilled with the w2 bolt spacing.

Yup! That’s what they did going back then. It helps racers fit the rules without recasting a W2 intake in cast iron. It’s a simple fix to get an iron intake to a W2 head to meet rules for the class.

Effective? No.
Cheap for the company? Yes.