Comp has a dyno sheet on the webpage for the XE262H. Their test engine has 9.25:1 compression and I think Dart's version of the Vortec head. It makes 325 hp and 415 lbs of torque. I am going to be using unmodified Vortec heads and a QJet carb, so I figure my hp numbers will be a little lower, but I will have higher compression so that might put the HP numbers right back where the test engine is. I am also hoping the higher compression will bring the torque curve down in the rpms just a little bit.