Hi I have A 86 GMC body on a 72 K20 chassis whith a 327. It used to be my grandfathers tow truck but I now use it to plough snow. I just recently noticed that under where it says 327 on the valve cover it also says "High Torque Model". Does anyone know anything about this? how much torque and Horsepower does this have? Is it rare? Any information on this would be appreciated.