ok so sitting over here in the desert most of my free time is spent looking up parts, browsing this site whatever. i just cant seem to find the answer to this question to any degree of certainty.

for our cars
do we or do we not need an ignition amplifier such as msd for 15-20 psi on pump gas.
i have read yes
i have read no

then say you go ahead and get the msd just to be safe
do you need the 6211 which just amplifies or the 6212 which can have the boost/retard feature

again i have read yes you need to retard boost over 15psi
and no you dont need to until over 20psi

does anyone know for sure

maybe i am just being a little cranky and tired of searching
but can anyone help
thanks