Thanks for the reply, dnult. Yes, the throttle plates were open during testing. I did the mark the harmonic balancer 30* BTDC using the pointer and a pencil. I removed the drvr valve cover and checked the intake valve opening point. Books read 26*, 28*, and 29* BTDC. I got 0* before the pushrod started to move. With this info, and low vacuum, I suspect late valve timing.
I believe the above problem is related to three dead cylinders during idle to 3K rpm and low(?) vacuum, i.e., 17-18". Apply more throttle, above 3K, and those 3 cylinders come into play. Another carb did not help. Good spark is available. Engine has been rebuilt before my time, how well, I don't know. It doesn't smoke or burn oil, plugs are clean.
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