I've had cars with both, and both look sharp. I changed the interior of my '67 convertible to Parchment back in '93 when I did a color change on the car. I went from a gold/gold combo to a burundy/parchment combo. In a convertible, a white interior is much more comfortable. With a hardtop, if you change from black to parchment, you can leave the black headliner in place if you want.....the carpet, dash, and steering column are black in parchment interior cars, anyway. It'll look fine.
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Jeff 
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