Thanks, all for input:D
I don't think it's a vacuum leak, because spraying the manifold and carb base with starter fluid didn't effect anything.
Phreakish
I set the initial timing at 12 deg. btc at about 900 rpm vacuum advance blocked, but hard to say because it doesn't stay there long
mguner
Yes a cast iron magnum manifolds so no heat riser valve so I don't think that's it.
I think your on to something there redfish. I have a clear filter, and it does look like it's running out of fuel. What did you do to fix this?