It's a Keeper

[dibbons]

Found this thermostat housing having been installed on my '65 Formula S with '66 four barrel intake manifold and 1980 318 cylinder block. "Made in Canada" means it's going right back on the engine (P/N 3698565). Appears to be an aluminum casting the factory installed in the 1970's.

 

[Murray]

That will match master cylinders and other stuff that was coming from Canada.