My guess would be............ you smoked a fusable link in one of the wires that comes off your starter solenoid that is mounted behind the battery on the fender. (fusable link looks like a tootsie roll) just fallow each wire off the solenoid till you see the link and try to determine if one of them is melbatoast. One might be grounding out on somthing and that caused the sparks. I had a simular problem and when the wire grounded out it fried my alternator.

Just a thought, could be somthing else but its worth a look.