Yup factory SS caps have cl***. Baby moons not so much but I do agree a nice set of five spokes would look, "right".
I like the Vietnam veteran's look of the 60s black rims silver lug nuts and clean whitewalls....When I was a kid when the soldiers came home on leave the first thing they did to the family car was pop the caps freshen the black and clean the whitewalls and hit the streets.....I still ***ociate this with a hot car!
64 SS caps are one of the best wheel covers there is and look great. Otherwise chrome OEM style wheels (not those cheap smoothies) and spider caps look very cool on 60's cars. Thats a real good looking 64. Gary