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I believe it was Mad Dog Headers

The block is date coded: 12/26/67 383 bored .030" over with flat tops. Intake is an Edelbrock Torker 383 with a 850cfm Holley center squirter built in the fourth week of June 1969. Heads are 906 with hardened seats and the large valves and no porting. Cam is a Hamburger 509 lift 292 dur...