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Brown is the negative so any other color is the positive side and that's what you " should " hook up, but if you read below in the link , you should tape up that wire and run a new one from the ignition switch with a bigger guage wire.
melsg5 is correct, the reason for running a new wire is that the Points ignition system runs on just 9.5 Volts (12 Volts when starting that is why there is a wire that runs to the coils from the starter) the used a resistance wire to decrease the voltage for the points system. Your HEI will not run properly unless you have a full 12 volts running to it. Good luck with the conversion, well worth it if done properly.