Lt1 to 383 stroker swap prices?

I have a nice white 1995 z28 convertible with lots of upgrades, but I recently found out that my engine is having a knock, so I have Always want it a 383 stroke, how much would of cost to do a complete swap? Im also interested where to find this type of engines(383) or the best way to go with this..any help will definitely help...((: