Do you have SSBBT3? The programming chapter there will help you answer those questions. But, basically, since you started your deadlift a lot lighter (155) than you say you can pull (315X2), you're served best by continuing to practice that (newer for you?) form while it's easy to still add a bunch of weight each workout for a couple weeks, before you introduce the powerclean. You can either continue to do some chins maybe every other workout, or once a week, or leave them out for the first couple weeks while you're deadlifting every workout.