1973 Dodge Dart Sport 340 production figures

1973 Dart Sport
Fastback Coupe: 68,113
340 Fastback Coupe: 11,315
Total 1973 Dart Sports: 79,428

As far as the Plum crazy color, there aren't any good numbers for that. There's a percentage of cars painted certain high impact colors, but no info on Plum Crazy for '73. If it's original it would have the code FC7 on the fender tag. Info here High Impact Color Production % #'s

Here's an old thread on Sunroof Dart Sports 1973 Duster & Dart Sport 340 SUNROOF cars

But no, doesn't look like there's any production numbers beyond the number of 340 cars. No break down for auto vs 4 speed, nothing by color, and definitely nothing for the sun roof option. It's a pretty rare car, but, it's still a '73, so value and rarity aren't tied as closely together.