In my opinion, there is no "best" because the engine is
part of the theme.....most builders have no theme but the
really good cars are built with a consistency in mind....the
engine, paint, wheels/tires, plating, upholstery, etc work
together to make the statement that was intended.

Too many cars have mixed themes which make them look
awkward. An early 50's style roadster would look kinda
strange with a blown LS motor while a late model
Camaro would seem strange with a flathead....

We all recognize the billet mirror on a period rod but the
other stuff is equally important....gotta have a theme
a you gotta stick to it. Like mixing chrome and polished
aluminum, mixed themes are hard to pull off.

mike in tucson