I have some pictures of Goose #4 and Goose #5
here. There are a couple of shots of #5's engine including one showing a date code of D278.
These were built from Pierce-Arrows and were re-powered with the GMC big truck engines in the late '40s.
I was in Ridgeway last week and checked on the progress of #4.
Google Galloping Goose for lots of info.