On the top dead center it was never my understanding that the mark was at 6
degrees, thought it was at 0. If 1 and 2 are firing and 3 and four have no
spark it is probably not ignition timing, that should affect all 4
cylinders, first guess and easiest is plug wires reversed on 3 & 4, if you
did a rebuild and this is first start do a compression check if the wires
aren't reversed, maybe a compression problem on 3-4? but that would be odd
to be on both too, I think something is off in your ignition wiring from the
problem as you describe it.
Good luck!
Greg Lemon (been there done that)
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