If it is supposed to be a "restored to showroom look" truck those are the wrong wheels and they are the wrong wheels for the stock caps. Those look like mid 60's wheels but I may be mistaken.
You might check with
http://www.rallyamerica.com/ and see if he has or can get the 47/53 style caps to fit those wheelse
One option might be to put baby moons on the truck and have someone stencil the Chevrolet logo on them.