I believe the T RPU shown above has a full belly pan, you're just seeing the outer ends of it in the picture.
Don't believe it is an A....but a late T and a good looking one at that.... with a belly pan to give it a dry lakes Roadster look....
Dick Flint's and Bill NieKamp's 29's.....and some A's in here: https://www.jalopyjournal.com/forum/threads/pic-request-hot-rods-with-bellypans.41372/