Resistance values. Distributor should be near zero on all posts. 7 is probably close enough. You didn't mention if you checked all five posts.
Rotor. Should have a resistance value stamped on top of the rotor. I don't have any around here - ran out of red block volvos about four years ago - but I recall seeing a 2K stamp on one. Different years may have different values.
You seem to have eliminated the usual suspects. I would probably go back and check spark at the plug wires again, using the old plug/ laying on the manifold method, making sure that all the distributor wires are fully seated. If still no spark, and the timing belt is properly aligned and turning, the next suspect is the distributor. Maybe something sheared where the shaft mounts into the cam? Can you turn the shaft by hand?
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