GReddy has just released some information on VR38DETT engines they are supplying to customers. From short blocks to complete 4.3 liter strokers, GReddy is going to have what you are looking for.
Each engine comes with WPC coated Nissan rod and main bearings. 3.8 liter, 4.0 liter, and 4.3 liters are available. If you are looking to build your engine, and looking for some options, Greddy is providing some very good ones here.