Will this cam work well with my radical 383?

Do you know your actual compression ratio? Not just what’s on the box the pistons came in. If you had a measured 12:1 and are running e85 and are comfortable selecting a converter to match (+or- 5000 stall) I would not hesitate to use more duration @50. Maybe a little more info about the car. Weight? Intended use? Strip only (if yes more gear also)? Tire size? These are the questions a good cam grinder will ask when you call them. And you should.