Manifold Vacuum Advance what am I not getting?

Newbomb Turk said
I’m only guessing because we don’t know your actual compression ratio or
what your cam timing looks like.

But I’d say a 9 Champion is as hot as I’d start with.

Can you post a picture of a couple of your plugs?

Let’s see what they look like.

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.