400 hp 318 vs 408 vs 440 BB

Okay well me and a shop buddy are having debates over which engine to slap into my dart.

I originally started going with a 408...But then a 440 BB sounded a little more nice into a Dart that exterior will look close to a GSS Hemi Dart.

Now my buddy is too interested with messing with a 318 build, the one on that magazine which I forgot the name of, where you put in some 318 magnum heads and port the thing out etc...

Here are the key points...

I wont have to pay for no machine work, nor much of the build itself only for parts new or used.

Car wont be my daily driver...just my fun machine...and escape horse to Mexico if I ever have to ha. ha. ha.

That said...which engine would you try out in a 68 dart 4 speed? a cheap to make super 400hp 318 (which friend says it will be quick, and still not too bad in gas as the 440) the 408 stroker or a nicely built 440? I myself love the roar of a Big Block...