it is probably a 3B REPU casting block with the short primary runners, the housings look like 76-78 year castings. i believe even the 76-78 model year REPUs still retained that early 3B small port design.
there should be a cast number/letter on the front iron under the water pump with either a 3B or a Y, Y is the tall primary runner casting for the cars.
Last edited by Rotary Evolution; 10-06-2013 at 11:06 AM.
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