Wheels for a 65 Belvedere

I was wondering what is the correct wheel and rim size for a B-body.

I know that its 5x4.5 but I do not know the offset.

This is what I have on it now: http://picasaweb.google.com/alex.doerstling/Belvedere#5267111295713707890

And I've got a set of these off of a 04 Wrangler: http://www.wheelsandcaps.com/images/886/ALY09018U.jpg

With 225/75 15's

I wanna swap them for the time being because the wrangler wheels have more life on them than the ones that I do now.

What would be "correct" would be a 14" rim, probably about 5-5.5" wide. So "correct" doesn't matter. I say bolt up the Jeep wheels and see how they fit