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Just tried to start it and it appears to only get spark when I stop turning it over and let off the ignition.

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I was going to say ballast resistor, but thats usually the opposite-spark when cranking and no spark when stop turning over.

I would disconnect the starter relay so the starter won't come on, and disconnect the wires on the ballast resistor. Check voltage at both wires for the resistor to ground. With key in "run" position you should 12v on one wire, and with key in "start" you should have 12v on the other wire. Could be bad connection somewhere-ignition switch, firewall, etc. Is the orange box grounded well?

I've had problems with the orange boxes, I finally have an MSD 6AL and I'm happy with it.