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There's really no such thing as a 351 HO. I assume you mean a 351W. Most 351Ws were truck engines and thus, in stock form, were set up for low end torque, not high rpm power.
Your engine most likely has hydraulic lifters, which will cause it to top out at about 6000-6500 rpm.
What year is your 351? What did it come out of?
Pete
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