@Fleetwood I still don't think it's fuel related, but if you have access to a fuel pressure gauge you should check the fuel pressure. If you don't try this. Spray 2 seconds worth of starting fluid into the throttle body and try to start it, see if it'll run. If it does let it stall spray more in a try again. If it'll run twice like that then it's most likely fuel, but I really doubt it, still you should check it.
Ok the picture of the spark. One issue is photos of light sources, and a spark is essentially that, pictures can sometimes misrepresent color but that is not good spark at all. To me going on the picture it looks like orange. Also in the picture see how it is only jumping on one edge of the electrode, assuming the picture is taken at the peak of the spark, not as it is ramping up or falling off. A video would be better, but you'd have to up load that to a video hosting platform and link it and it's not really necessary unless you really want to. If you watch the spark in real time while the engine is cracking see if it fully engulfs the electrode.
One thing I didn't get to type earlier is if we do decide that it's weak spark and not related to the coil / button or cap and rotor, in other words we decide it's the pick up in the distributor then you will need to decide how much distributor work you want to do or if you'd rather just drop in a new distributor.
@AuroraGirl gives a good description of how the coil to button is setup.
I can't come up with a diagram, but from the top of the coil down, it is plastic cover, coil, rubber isolator, and then the button. The "button" is the terminal in the middle of the cap when you turn it up side down. On the other side of that terminal or "button" is a spring which contacts the coil terminal. I've seen those get rusty or even the actual terminal on the coil. It's not common really for that to happen, but it does and is one of the few things that can cause a weak spark in this system.
Still you should do one of the fuel tests so we can know for sure about that end of things.