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My hunch would be to get your timing correct first. Pull the #1 plug, poke something inside and turn the engine by hand to make sure that your timing mark reads zero with the piston at the top. Some front engine covers could have timing mark pointer at different places, you need to eliminate that possibility first.
With the engine running at about 3000 rpm and NO Vacuum adavance hooked up you should have about 32-34 degrees timing with your heads etc. regardless of what it reads at idle (which would like to be around 20 deg. but that's another story)
I believe the 3924 plugs are a good match. If you get your timing right, fresh plugs and the AF ratio is good, you should be seeing some good numbers.
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