First of all have you had it on a good dynometer to see where you are at horsepower wise? Next you said the 1650 piston does not fit. Did you have a direct injection piston and not the older one? What was the compression height of your piston? I can take you 10 miles north of here and a Super would pull 4-14's, take you 10 miles south of here and a Super 88 would have a load with 2-16's. What gear code do you have?