I think it's human nature to round up horsepower numbers. Nick and his customer are rounding 734 to 750 (16 hp). Some on here who are critical of Nick and his customers rounding of numbers are rounding 720 to 734 (14 hp). I have yet to have a customer at the dyno round his numbers down.
I think the Original owner told the guy at some point it was like a 750 hp engine, but obviously at some point he also got the engines dyno sheet of 734 hp, so he knew what he bought.