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I'm running a similar setup and can tell you that the engine should idle just fine with 10 inches of vacuum. I would check the rocker arm adjustment to make sure you are within range that the manufacturer has recommended. I can also state that on my motor you can definitely hear that it is a solid lifter camshaft. I also set my idle around 950 rpms as low rpm idle setting can be very hard on solid lifer camshafts. There is a lot of load on the camshaft lobe as the lifter begins to ramp up the cam lobe.
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