i set mine with 2 flats pre-load with some one in the car. lower hole. leave right at idle or a little bit above

video link
http://youtu.be/tBwyPmOzqBQ



68 Dart GTS "HEMI" 10.30 @ 131 pump gas street car 3780#
69 Roadrunner 511 six pack 10.92 drive to track street car