I would have to disagree, I would want the #'s matching car.
Everybody has a car that doesn't match and anyone can build a 6cyl car into something special so if you don't care get a 6 cyl car and have at it.
For the guy that cares, keep the car together, for a guy like you who doesn't care and I take it you don't have a 340 don't discourage the guy because he's not sure or doesn't know.