I Think My Cam Is Too Small

I just playing around with some numbers I grabbed today on a stroker engine I plan to build for the Duster on some dyno software I obtained. I'll be picking up the 400 B block this coming Saturday. I've never built a big block from any manufacturer and I know that CI really mellow out a cam but this is ridiculous. I damn near fell out of chair lauging... 682 ft. lbs of torque at 2000 rpm?

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ScreenHunter_04 Jan. 17 21.39.jpg