318 vs. Slant value

So let's say for example that a car has been "restored" say for example a 72 duster

A 340 or 360 sits in the engine bay, the front brakes have been swapped to newer disk brakes, rear end upgraded to a torque handler. Someone swapped in buckets and a console with good correct parts. Maybe a sharktooth grille to add flavor. A nice shiney mopar high impact color that is nice and waxable.

All that said, would it matter for the overall value of the car if it were originally a 318 v8 over a slant, or would the original engine size be irrelevant.???
I agree with 69conv. The 318 car should have a little better underpinnings. Sounds like a nice 72 anyway ;)