Update: I removed and cleaned the rocker shaft ( see my other post). Idled engine forever to get it hot ( clutch was stuck so I couldn’t drive it) then set lash. Immediately my vacuum reading got higher and the flutter subsided some. Then I set timing as best as I could with my light, finally I just put it 4 degrees BTDC per the scale on the hold down clamp, or so. It was several degrees retarded from thst point before I started. Engine seems happier and I’m getting about 21” vacuum at a slow idle.
Got my clutch (mostly) unstuck and took some laps. Still has off idle hesitation inspite of my rebuild on the Rochester B.
Then I sprayed carb cleaner around the throttle shaft and sure enough it’s leaking.
So, I’m making progress thanks to you guys.
