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Bruce,
I am not certain and I can't find my book, but for some reason I think the torque for the spark plugs in a 65-68 427/428 is around 35 pounds. I know that I have it in one of my books but just can't remember which one. As for the engine to not seem to have the snap you expect, that could be your cam if it is fairly radical. Also jetting and such as you stated. But I have changed cams a few times in my big block and have really noticed differences in how it ran at low or high RPM. The one in it now is sluggish as crap until above 3500 and then it feels like an afterburner kicked in. Also at low speeds you could be loading it up some. One of the people here will be able to tell you for sure if I don't find my book sooner.
Ron
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