Just take the top cover off the coil and connect 12V to the terminal that's hot with the ignition switch in the "run" position. Ground the battery to the housing. Spin the shaft, and sparks will jump to the laminated coil core. No wires or spark plugs needed. I use a cordless drill motor with a sanding cartridge roll pressed against the bottom of the drive gear to spin the shaft, with the distributor housing clamped into a vise. That 1/2" spark that jumps from the plug wire towers to the coil core is a little over 50K volts- - - - -don't get your fingers close to it!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!