spark at the plugs

[1934]

On the right side the 2 middle cylinders are not firing, on the left side it's the first and last that are not firing. I think the plug wires are good because there is a strong spark when I short out the plugs.
Last fall I had the distributor out and put a NOS rotor in and new points. Maybe something got screwed up when I reinstalled it. But I don't know why the spark is good at the plugs if it is shorting somewhere? Guess I'll take the dist. off again and see if I can find anything.
Thanks.