Ken,

Your method tries to tie in 0-60 with hp. I guess the ideal way to do it would be to have multiple points, and then fit it to a model. I'll hazard a guess that these 0-60 times will fall into the center part of the curve, which if like most models is quite linear anyway. So, I would say using straight ratio your horsepower would be 199hp.

Kuan (now I really feel stupid)