Well i'd advise don't go chrome. Much harder surface to seal since its so slick.
The stamped steel 904 pan i have, i like. Never understood why the 727 pan is another ~$40 over the 904. How much harder can they be to make? Get another quart, comes with a filter spacer, and drain pan. All happy here.
Make sure you get the nice thick rubber reuseable gasket from your local dealer. If they are too lame to not know they have '1970' 727 trans gaskets there.....just have them look up the earliest dodge ram they have in their parts catalog, 360, 727, it'll show.
Thats what i did last time i needed one.