IIRC the plastic cover tab is not set right for your balancer.
Likely you need to reset it by verifying tdc #1.
http://www.crankshaftcoalition.com/w...op_dead_center
No cheating. Use a piston stop like in the link.
You gotta get your idle down a bit more to set timing. At 800 you might be just tipping into the mechanical timing.
The drivers side port is manifold vacuum.