Thanks. My next attempt is to increase the timing from 15 to 18-20. I’m running live manifold vacuum to the advance. The mixture screws are currently at 2 1/2 from seated. I’ll adjust with a vacuum gauge and a tach if I can figure how to attach it to the GM HEI distributor. First, getting the rich idle squared away then ensuring the total ignition advance is as you’ve described. My gut fear is I’ve paid to have a junk carb overhauled and have seen no benefits. I’ve owned this Firebird for two weeks and really wanted to drive it some but of course I can’t when it gases me in the process. I have to shuck my clothes in the garage and go straight to the shower after tinkering with it because of the fumes. I wished I had a plan B for another carburetor but have no idea what carbs are consistently proven as quality remanufactured etc. The Holley spreadbore (don’t condemn me) is at least a new carb, with warranty, and will bolt to my intake but it’s close to $800. Hopefully more adjustments will take care of this but being realistic and planning for the worst….
