Well, I'm going to tell you you are wasting performance by limiting lift. I can take the heads you say "stall" at .450 lift and make them not stall until well over .600 and I can make them stall lower than .450, I'd bet as low as .200 so I'd pick as much lift as your valve gear will take.
Stock rockers will be .500 and adjustables will let you go .600 plus. Not saying you need .600 plus, but you need more than you think you do.
Stall is a bad way to pick your lift.