Engine stalls upon braking

It has been a while since I've had time to mess with this thing. Since it was down, I pulled the covers and set the valve lash for the first time in ten years. Not terrible, but they were due. It looks like the float level was not as "spot on" as I had thought. I have gotten the most improvement from a SLIGHT adjustment to the float. I put a couple more marks on the balancer so I could see where I'm sitting on mechanical advance. She ain't perfect, but she's getting better and is at least driveable!! Thank you all for the advice.