Small block valve springs upgrade

So I’m working on a set of 596 360 heads. The cam I’m putting in the engine .507/.511 lift. The factory springs probably won’t handle the lift, the springs that comp cam suggested are a double spring with a dampener. These springs are upto .600 lift and require some machining and different valve seals. I’d like to find a single spring that would suite my needs preferably use the factory retainer. I found some Mopar performance springs. That might work, most say upto .500 lift and may need retainers. Has anyone done such an upgrade and can steer me in the right direction to find such a spring? Thanks