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Put 2 nuts on the stud, tighten them so the are together, and unscrew the stud it from the head using the inside nut. Very easy to do.
Probably a good idea to drain your radiator a little as some studs are into the water jackets on those heads.
Kroil ... miracle in a can ... it has never let me down on a seized bolt. http://www.kanolabs.com/google/?gclid=EAIaIQobChMIp5eBntKM4gIV3f_jBx01PgLyEAAYASAAEgLBfvD_BwE
Not sure if this is the case but in the mid/late-70's I helped a friend put headers on a small block Volare. We had to tap and plug the small smog ports at the bottom of each exhaust port on the heads. It was very difficult to do with the motor still in the car.