MM,
Until you set the lash to the correct amount, stated earlier by me, you should not attempt any tuning of the carb or ign.
You think 30* is a lot of initial? My 1966 GTO, as well as millions of other GM cars, drove off showroom floors with well over 20* of initial timing. 26* for my car to be exact, with a veeery mild cam.
Sadly, you are not understanding this relationship & I have explained it so many times on this & other forums that I do not feel like doing it again. Initial & total timing are different. You set initial first, & then total by modifying the curve in the dist. Some people use locked dists, so if the initial is 34*, it has 34* from 0 - forever.
Here is a quote from D. Vizard in his Holley book. Think about why idle timing is mentioned in a carb book......
Page 30: ' The optimum idle advance is typically about 35-40* for a short cammed street engine & [ though not commonly realized ] as much as 50* for a street/strip engine.'
Failure to note this excellent advice will result in less than best idle quality & off idle response.
