Is there a simple/easy way to ID a 273 engine vs 318?

I'm looking at a '67 Windsor-built car that the VIN says had a 318 (which means it would have been a polysphere).

The current owner (who to me has an unknown level of familiarity with vintage Mopar mech/tech) says the car has a 273. Maybe someone told him that, and he doesn't know any better. I don't know.

I haven't been to the car, it's a bit of a drive for me.

Is there an easy way to know if it's a 273 vs 318? I have an LA318 in one of my cars and I know it's impossible to see any...

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Author: 67CBodyGuy