power source for choke

and other acessorys, 67 notch.
I`ve been searching the forum and getting conflicting suggestions from the threads.
Two of the options are voltage regulator and ballast.
Which is best? or any other options? I don`t want to rob absolutly no power from ignition circut if possible?
I also need to power a radio and tach, I have 1 open space in fuse block but their is no clips for the fuse, are these clips available and where?
And where would be the best place to junction to power this new circut?
Thanks