That's what I was told by Eric Staffold(spell check) at Afco. Mine are set at 24 from full soft rear and 26 from full soft in front for a good track and 6-10 on a bad track.

http://youtu.be/SZmD3i_0bek?list=UULW0DiOvUx5TJJIEelJ2a7w


70 Duster W8 motor.
1.29 60ft 5.79 1/8 at 120 mph
glide with 1.80 gear
@3170 lbs.