Since I built the engine I can add some facts.First its not a 389 its a 366.Nothing super duty about the engine.The engine was at M/Ts in the early 60s,finally bought it years later.The block was designed to be run without sleeves.Low performance 1.80 1.60 valves in the heads.We put 60 over 350 liners in the block.Cam is a Summit 2801,stock rods and cast pistons.Intake is a 61-62 SD intake and carbs are clone SD carbs,valve covers are repop 63 SD covers.Is a super rare engine,only one I have ever seen that came pretty complete from the factory.Tom
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