I always use a country rule of thumb... if it pops flame out the carb the timing's fast, if it bogs and pops out the backside, it's slow.
Granted I'm not a guru, but it usually is the case from my experiences.

Jerry

1959 Chevy Apache 3200 Stepside
In the Stovebolt Gallery
Restoration Journal on Facebook

"A government that robs Peter to pay Paul can always depend on the support of Paul." ~ George Bernard Shaw