My new 89 Mustang GT

Black ext with red is nice. Burgundy color ext with red looks good and white with red looks good.
 
When you said switching to red interior I was miffed. However that looks pretty good, nice work. I had porno red interior in my 90LX (exterior was grey) and wanted to switch to black but the car was stolen (glad I didn't). Those tailpipes are bit much.