carb tuning help

Here's an original thought, how about finding out where the engine wants the initial timing, THEN spend money to buy the correct bushing to hit your total number...

Stop pulling numbers out of thin air thinking they may be what you need, it's expensive when you do things that way. Let the engine tell you.

Get rid of the garage door springs holding the advance now too. At worst I'd run two middle springs (blue) and most likely one light sliver and one blue.