Chevy 235 Electrical Question

[richard]

Open to suggestions: I have a 235 (1958) in my '52 GMC and cannot figure out how to get a spark to my plugs. Here's what I've done so far:

Short background: I pulled the head for a rebuild and the engine ran beforehand. Re-installed the head and below is where I'm stuck.

1. New battery / new ignition coil / new cap & rotor / new plugs / new plug wires.
2. Engine turns over but won't fire. Fuel is delivered properly so I checked for spark.
3. Pulled a plug searching for a spark....nothing. Had naïve teenage son hold the plug wire while cranking......not zapped
4. Tested the ignition switch and new ignition coil with a multimeter and they receiving proper voltage (with key on)
5. Tested the connection between the coil and distributor cap...............proper voltage. New plug wire is good.

6. Tested the connectivity between the center of the distributor cap (from the coil) to cylinder 1 (within the cap)..............no connectivity. This tells me the new cap is defective.

Does anyone have a clue what I may be missing?

Thanks for the feedback

[richard]

UPDATE: Since posting a few days ago I've gotten the truck running. For the sake of others who may run into the same issue below is what was done, in addition to steps taken as shown in my original post.

- Confirmed the ground was solid from the block to the frame.
- The cap turned out to be good after all.
- Made sure the points were properly gapped on the high lobe position
- tested the ignition capacitor within the distributor. If the voltage starts low and rises at a quick pace the capacitor is good. If power spikes right away (no gradual rise) the capacitor is bad.

After check all of the above I turned the key and the truck started immediately with no hesitation.