The short answer is yes. You totally can make 800+ with a 383. Really skies the limit with a big block and boost. I have really no practical knowledge about doing a single turbo. Everything I have built that had a turbo had two of them. I know that I prefer to run the .96 A/R housing. I know that with all the the exhaust going through one turbo it will need more exhaust flow. I would recommend the turbo forums and look around and try to pick up some knowledge there. Sorry I really cant help you out.