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Guess you got lucky , i sprayed a 300 shot pulling too much timing for the distributor , blew the throttle bades & boosters right off the carb mid track , set fire to the bulk head wiring & fried the hood , have since fitted a 'cap adapt'.

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When spraying you should phase your rotor to what the timing will be on the spray or this is what can happen.

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Yea i know , was only pulling 13* on a stock cap which should be good for around 20* of retard (MSD), since then have gone for a larger cap with two piece rotar , no problems since , cylinder pressure can be a killer.

It's difficult to phase a stock cap pulling 13* of retard to fire right where the rotor meets the cap terminal , with high cylinder pressures the rotor will prefer the easiest route , hence the next cylinder whilst the intake valve is still open , either a crank trigger or adapt a cap is the easiest way to avoid this happening , had to modify the valve cover to fit the 'adapt a cap'.