Hi kooler,
For a bigger spark, utilise 2 car ignition coils wired in parallell but connect the primary terminals in opposition. the spark jumps nearly a foot if you can properly insulate all the primary windings. When it gets you its not that forgiving. You shout at it though lol. I made this several years ago but powered the primaries with 600 volts through an SCR discharging around 2 uf of capacitance. I expected a 6 inch arc and got double that ... I was a little too close .. but you know the rest lol.
Steve.
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