I finally found my manuals. They don't cover the 383, but they cover the 305-377 CID engines. I suspect it is the same but I don't know for sure. It does cover the 350 MAG MPI.
I think I have a gen ? cool fuel? Mine looks like this
https://www.youtube.com/watch?v=eZYJq746awc
Pretty much you have to detension the serpentine belt and pull the whole pump. It looks like the procedure is pretty similar, brass versus composite housing.
my manual goes from 0M300000-1A299999
If you know which housing you have I can scan pages. I suspect your engine and mine would be the same.