I'll try this one. The power valve "sinks" into the fuel bowl with engine running and full manifold vacuum applied. Open throttle, and until engine rpms catch up to throttle position, power piston will open, then as vacuum (rpm) catches up with throttle position, power piston sinks into bowl. I'm sure you've set the idle vent @.050" IAW ( in accordance with) overhaul instructions.
Use a vacuum gauge and perform the adjustments, idle mixture, base timing, and use dwell meter to set point gap and adjust for max vacuum reading. With stock cam, should have a steady 18-20 inches of vac.
Another place to check is the timing chain/sprocket slack using a flex handle and socket and the harmonic balancer markings and rock the crankshaft back and forth and count the degrees of slack against the pointer. Anything over 10*, replace timing set.
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