Wait, are you saying that full in is all fuel and no air? I may be misunderstanding the purpose of this adjustment...if that is the case, this thread answers it and I've been adjusting it backwards:

https://board.moparts.org/ubbthreads/showflat.php?Number=7637012&page=0

to that point good thing I didn't have the impact on full hammer when I took the driver side wheels off as they are reverse thread, I didn't realize there were still doing that in '68.