We talking night and day in a good way or night and day in a bad way?

My dad's 1946 1/2 ton currently has 215/75/15 bias tires on it but they are 30 years old and due for replacement. This very morning I called the local tire shop and had them order a set of radials for it.

I honestly think that bias tires look better on such an old vehicle but they are too costly and too un-available currently.

The truck currently rides like a wagon, I am curious if the radials will have any impact on that? As far as cornering, well it never goes fast enough to matter.