Make sure you get a 20r head with the power steering bosses. Some early ones did not have them. You will have to plug a few things on the 20r intake like the water choke fittings. It's easy to figure out though.
X2! My 20r head is off a 76 or 77 celica and has no bosses. With my lack of fab skills and, at the time, nowhere to work on it, it was a pita to fab up a half-ass setup for the steering. If I get around to it, and if santa brings me a welder for christmas, I do plan to fab up a much more solid setup than I am now running.