There's some history on the Moose Crew website,
http://www.themoosecrew.com/history.html
And this... their site notes it as being 1964.
Don't forget about the York Reunion and Nostalgia Nationals! They're having a Gasser Reunion this year. Show & Cruise Fri-Sat in York, PA, and then Nostalgia Super Stocker, Gassers and more racing at Beaver Springs on Sunday. Coming up mid-July.
www.yorknostalgia.com