And what, pray tell, is it for?

quasi, it is for propelling a motor vehicle along a carriageway

Thanks for clearing that up. I wonder if it would fit in my old station wagon. I mean in the engine compartment - I'm sure it would fit in the back.

they're thinking of shoe hornin' it into a Mustang, but i think it's currently in a Astin Martin with different valve covers

Really old school GMC V-12 gasoline truck engine barn find. Not much hp but tons of torque in these. Sounds good.
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Spark plug threads will probably pull out of the heads on this one too.

it looks like they're also thinking of shoving this into an F-150 Raptor

You are correct fossil. It is the same as an Aston Martin V12 Vantage. Company I work
at here in the UK just got the contract to rebuild them for AML.

I imagine a v12 would spin nice and smooth. I wonder how fuel consumption is on one.

est. 9 mpg....that means 4 or 5 at best?