Twin Turbo 383 questions

IIRC the term GT45 is a family of turbos. Kinda like the generic term small block Mopar. They have a few different versions of that turbo. I know they are a small frame turbo using a T04 exhaust flange which is the limiting factor on those. I heard the ones sold on ebay are 61mm inlet even though it say 4 inch which would be 96mm roughly. Not possible. Turbos can be as complicated as specing out parts for your small block. Compressor housing, compressor wheel, exhaust housing, and turbine wheel all contribute to a proper working turbo. If I were you I would be thinking twins unless you go with a large frame turbo. I know what kinda power your used to and if you want to knock it outta the park then I recommend doing some homework on which turbo you want and where you get it. I think you mentioned you already had the turbo from ebay, if thats true then twins are what your going to need to make good power. Boost isnt the only thing to consider when figuring out how much power it will make. Whew, sorry for that.