Not Ranked
500-1000 + depending on their condition. Unless you are building a "K" motor, save your $$. They offer no performance advantage over standard 289 heads. Valves and ports are the same size. Just mill the rocker arm studs for screw in type and you have essentially the same thing.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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