Top frame paint color?
The white frame may have been part of a special dealer package... Or a seasonal/regional color. Lots of those were done in the day.
In Milwaukee we had "White Hat Specials"... Since corporate ads touted Dodge as " The Good Guys with White Hats" it was a take off on that.
Most of those cars were white (not a common color) or had a white vinyl top...maybe a white interior.
Not sure about ragtops.