I think the dyno calculators typically are goin to give you a wheel HP number and on top of that they are going to give yuo an average HP number not a peak HP number and not all cars use all the HP in the first place, like mabey it don't hook quite right or the converter stall is a little off so I would say his HP could be close to the numbers from the dyno and if they are optomistic it may not be as much as one might think.