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Put your timing light on it and have someone drop it in gear for you, if the timing drops, the advance springs are too light.

If it stays at 16 all the way down to 7-800 rpm, my guess would be a lean condition. Richen Idle screws and check for vacuum leaks.

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That would be my advice too. Nowhere enough cam for those kind of problems. I have a 509 in my 440 with 15 degrees initial timing and my Rpm goes from -800 in park to 750 in gear.

Don.