What size rear Wheel Cyl.? K/H conversion.

I have all of the system pretty much figured out but the rear cyl.requirements on my daughters '65 Barracuda. K/H up front, right prop. valve all new lines, new Shoes and hardwear on 7 1/4 rear but the size I should run on wheel Cly's has come into question. Any thoughts on this ? Going to be her D.D. but she will AutoX it a little if I can get her mother to O.K. it. You know how it is.... Any input is welcome. Thanks, Tim
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