Ride height

Re: 72 Demon 340
Trying to set my height. Manual says it is 1 5/8", obtained by subtracting low point of ball joint to floor from low point of adjusting blade to floor. My car shows that to be 4 1/8". It would appear that with that much discrepancy I am doing something wrong. Car appearance seems to be front low. Any ideas ????
YOTE