From memory the last springs I ordered were about 200 or maybe 220mm free length. It's low, how low depends on the rate too. I was almost resting on the bump stops on the rear, so cut the bottom section off them.
Whether your exhaust will clear totally depends on how it's built and routed. No-one can give you a solid answer there. But if you've run it so far without ever hitting the body or diff then it's likely got clearance to everything, even when your suspension is compressed.