A couple of questions:

1) Did you replace the cap and rotor?

2) Does the engine try to fire at all?

3) When you say you have no fire, are you grounding the plug threads?

4) Are you certain that when you installed either distributor that you aligned it properly and the crankshaft timing mark was on TDC on the compression stroke instead of the exhaust stroke? Careful here, 'cause it'll fool you. There are tunnels inside the cap that move the firing contact point for #1 and #4 about 90 degrees. On TDC compression stroke, a rough idea is that the rotor should point at the middle of the firewall behind the engine. Another way to set the distributor is to align the dimple on the gear with the line on the distributor foot, hold the relationship and set the distributor with the foot over the bolt hole and release the shaft allowing the gear to engage and drop. When it bottoms, the rotor should point toward the middle of the firewall.

5) Is it possible that the valve timing belt is broken? If you remove the black plastic cover on the driver side head you can see the timing belt. When the crankshaft in on TDC compression stroke, the dimple in the cam gear should be aligned with the mark on the housing. Again, be careful because I think the mark is fairly close on the exhaust stroke, but dead on the mark on the compression stroke.

Frank