For tuned port injection, you have two options that I know of, Either Edelbrocks new kit:

Or try this site:
http://www.customefis.com/
Otherwise you are on your own to fab up your own kit. As for will the inline 6 bolt up to the TH400, yes, but you need a new flexplate for that engine and might have to add some sensors in, or make sure that you get the engine/computer from and auto. I haven't done this swap, but I know that it is very doable. Let us know if you need any more information!
Jack