Those 1406's are definitely way lean out of the box. Mine was so lean that it had me chasing a ghost, thinking that my fuel smelling car was rich, when it was actually way lean. If you take a look at this, http://vb.foureyedpride.com/archive/index.php/t-74438.html , he makes some interesting points that others tried and had success with, and it made sense to me, so I tried it. Boy what a difference. Basically it says that since the 1405 & 1406 are the same carb, other than one being manual and one being elec choke, that you should just use the 1405 tuning chart and calibration kit. The 1405 is factory performance tuned and the 1406 is economy tuned (read LEAN). IIRC 1 step Rich on the 1406's economy chart was still 2 steps lean on the 1405'a performance chart. It worked wonders for my car's time.

roe