Got a block casting number?
Based on photos alone looks like it’s from a Canadian car
the serial number stamps font 9 and 6 are rounded leg style and the 5 is a nice bubble round on the bottom, both details of the Canadian stamping vs the USA straighter font used
And the format of the number itself matches what you would find in a Canadian car, trucks usually started with XC for example and a car was a C number
-s