Hot Rods Whats up with this vintage chrome bellhousing adaptor?

Well, Found this in a barn under a work bench. Its a Glenwood bell housing for an Olds, all chromed out. It says Guardian on the back. Im guessing its for a drag boat...ever seen one like it?

 

Yep.................... All the Time..................... It's for a boat!

 

It should fit a Buick and a Pontiac also... I think?

 

So They are common?

 

Glenwood still makes them but that's definitely an older model. Never seen one stamped "Guardian" before.

http://www.glenwoodmarine.com/