Thanks for your response /input. I did in fact rebuilt the stock linkage and tried to unsuccessfully to adjust the pedal height (as I have limited clearance between pedal and floor pan). I discovered that I was utilizing just 60% of my horsepower as I did not have enough tension in the linkage or clearance between pedal and floor! My hunch is that I am still utilizing just 85% of horsepower (due to lack of pedal clearance). Thus why I now considering replacing the pedal set up or converting to the cable system. Either approach could solve for me not being able to access full power but I agree that the cable conversion will be a bit more expensive and time consuming.