remove the tension on torsion bars

I will be doing this too soon.....
Should I count the number of turns so I can reinstall it close or is there a better way?

No, if you put larger/stiffer bars on it, then it will need a different number of turns to get the ride height.

When you get the front end rebuilt, then adjust the ride height as described in the service manual.

Also bounce the front end up and down a little between adjustments to let it settle before evaluating...