get a vac gauge to watch for the highest vac reading while your set the base timing
set it with the most vac you can then back it off one full #
example...19 pounds of vac is max,back it down to 18 and look to see where the base is set
test drive,advance it till it just has a slight ping on a hard wot blast
time light and set the idle air needles just go back and forth adjust curb idle and fine tunning it
way i duz it,i am at 14 base and 19-20 pounds of vac,curb idle at 850 rpms
i can stomp it to the floor and it wont miss a lick getting with it out the hole
good luck