Manifold Vacuum Advance what am I not getting?

I pulled my number one plug to look at it but honestly, I have almost no time on this motor as it is this may be 20 minutes of tuning and driving around about 7 miles. I don’t trust you yet for high uses. I’m having some brake issues and I’m working through.
You say you're having some brake issues... what kind of issues? if you have power brakes, are you sure there's not a vacuum leak to the brake booster? Because that could sure make a HUGE difference here. I also agree that you need a looser converter, which will also make another big difference for your setup and the way it idles in gear.