With that CR, you would probably want a forged piston. Just got a set of Ross forged pistons for my 69 390 thru Mad Dog (www.fastengineparts.com - 800-792-9984). They are some nice pistons. Ran $549 for the set with pins. They have some in the 10:1 range and some in the 12:1 range. To get the dish you're looking for, you may have to go custom. I know Ross and Keith Black will both do custom AMC pistons.